Is she crazy?

So short story.

I tried to date a co-worker, and it didn't work out.

Anyways. Since we work together, and didnt want any awkwardness, we just decided to be friends and all that junk. For a while, it was fine. We would chit chat during breaks, occasional text about stuff, ect... Nothing out of the ordinary.

So the Christmas season comes up. I win a gift card that I really had no use for. She joking says I should re-gift it. Day before Christmas break, I get a bunch of Christmas cards for people that I talk to at work, her included. I stick the giftcard inside the Christmas card with the tag "haha re gifted" thinking I was being funny.

Day after Christmas break. She walks into my office. Throws the gift card in my face, says she cant accept it, and walks out. I call out to her to find out what that was for, but she storms off. Later she said via text that I read into things to much apparently. I explain that it wasn't meant like that, and how I gave a bunch of people cards. I am met with silence.

2 months later. I am still met with mostly silence. I've since given up trying to figure out what happened, but it still bothers me a little. Yeah, I liked her, but friend wise, it was nice to be able to talk to someone at work about shared interested and such. Now, I might get an occasional nod in my direction, but that's about it. Any attempt at conversation is just awkward at best.

Sooo.....was she crazy? Or did I somehow totally fuck something up?