I prepared a breakfast for my parents after giving a blood test and coming back home all alone

And my mom called me saying she will visit her friend and won't make it home yet. She never said a word about this before, not even said as a probability as if she wasn't sure yet. she didn't mention anything this morning.

I am (20F) not in a relationship currently so I thought I was healing because I was doing better🤣

but recently I felt so much rage against my mom saying her friend can be her new daughter etc. (I acted mature tbh for not saying extreme things even though I felt extreme- I am aware it wouldn't make it right)

I feel like she- my own mom- prefered her friend over me.

I cried a little bit. I do not know. Maybe I am tired because of hospital work