Run, Weasel, run as far as you can, run and hide and never come back. -ACOK, Arya V

In this post, I am going to attempt to look into what could have happened/befallen to Weasel aka the crying girl who travels with Gendry, Hot Pie, Lommy and Arya in A Clash of Kings.

Weasel aka The Crying Girl

Wiki Article: Weasel

Background

Yoren and the NW's recruits originally find her in a holdfast in the Riverlands:

This empty town frightened her almost as much as the burnt holdfast where they'd found the crying girl and the one-armed woman. Why would people run off and leave their homes and everything? What could scare them so much?

Once they are discovered by the Mountain's Men, it is revealed that Weasel escaped:

The man with the torch searched around under the trees. "Are you the last? Baker boy said there was a girl."

"She ran off when she heard you coming," Lommy said. "You made a lot of noise." And Arya thought, Run, Weasel, run as far as you can, run and hide and never come back. -ACOK, Arya V

Arya then uses the name for awhile:

Arya dared not say her true name, but Arry was no good either, it was a boy's name and they could see she was no boy. "Weasel," she said, naming the first girl she could think of. "Lommy called me Weasel." -ACOK, Arya VI

House Frey

You would think that a girl who looks like a Weasel would be associated with a certain Riverland house:

As the northern lords studied the castle, a sally port opened, a plank bridge slid across the moat, and a dozen knights rode forth to confront them, led by four of Lord Walder's many sons. Their banner bore twin towers, dark blue on a field of pale silver-grey. Ser Stevron Frey, Lord Walder's heir, spoke for them. The Freys all looked like weasels; Ser Stevron, past sixty with grandchildren of his own, looked like an especially old and tired weasel, yet he was polite enough. "My lord father has sent me to greet you, and inquire as to who leads this mighty host." -AGOT, Catelyn IX

but it should be noted that Weasel doesn't actually look like a weasel:

At the sound of her voice, Weasel came creeping out from the bushes. Lommy had named her that. He said she looked like a weasel, which wasn't true, but they couldn't keep on calling her the crying girl after she finally stopped crying. Her mouth was filthy. Arya hoped she hadn't been eating mud again. -ACOK, Arya V

The Inn at the Crossroads

Since Gendry saved her life, I considered it possible that she might have ended up amongst the orphans at the Inn at the Crossroads.

"Four would be a few. Ten would be a surfeit. This is a cacophony. Children should be wrapped in swaddling clothes and hung upon the wall until the girls grow breasts and the boys are old enough to shave."

"I feel sorry for them. All of them have lost their mothers and fathers. Some have seen them slain." -AFFC, Brienne VII

and:

They glared at one another. Then Willow stomped her foot. "They have food, Gendry. The little ones are hungry." She whistled, and more children appeared as if by magic; ragged boys with unshorn locks crept from under the porch, and furtive girls appeared in the windows overlooking the yard. Some clutched crossbows, wound and loaded. -AFFC, Brienne VII

and:

The common room was crawling with children. Brienne tried to count them, but they would not stand still even for an instant, so she counted some of them twice or thrice and others not at all, until she finally gave it up. They had pushed the tables together in three long rows, and the older boys were wrestling benches from the back. Older here meant ten or twelve. Gendry was the closest thing to a man grown, but it was Willow shouting all the orders, as if she were a queen in her castle and the other children were no more than servants.

and:

Septon Meribald asked if he might lead the children in a grace, ignoring the small girl crawling naked across the table. "Aye," said Willow, snatching up the crawler before she reached the porridge. So they bowed their heads together and thanked the Father and the Mother for their bounty . . . all but the black-haired boy from the forge, who crossed his arms against his chest and sat glowering as the others prayed. Brienne was not the only one to notice. When the prayer was done Septon Meribald looked across the table, and said, "Do you have no love for the gods, son?"

So while no direct evidence, there are so many orphans, and it is in the general region that Weasel was last seen.

Other Quotes

Its not much but we get a general description of her appearance:

He never told her his name. Neither did the waif, the little girl with the big eyes and hollow face who reminded her of another little girl, named Weasel. -AFFC, Arya II

Maybe she traveled north with someone?

Jon's sword hand opened and closed, flexing the burned fingers beneath the glove, but Longspear Ryk only laughed. "And where would you find a weasel in the snow?" -ASOS, Jon I

TLDR: There is a good chance that we never hear from or find out Weasel's fate, especially due to the scant information available about her. That said, it would be pretty cool if she was one of the orphans at the Inn at the Crossroads.