Dear Eve
I'm sorry to hear that.I think you can talk wih her first.And find the differences between yours.Next,you can tell her that you need a quiet enviourment when you are reading,I think she will be sorry about it.At the same time,you should understand her,for example,it is only a joke.Then,you can tell the story to her mom.
I hope you can be getting well with her.
Yours,
Anna