If "fitting in" is what she thinks she needs to do right now, there is nothing you can do to change it, you just need to accept it and move on as hard as it is. I would not entertain the "friends after school" proposal. Real friends are friends 100% of the time, not just when it's convenient for them.

You don't need friends to validate yourself... that's something I am going through right now too. Remember this is just for today, not forever. You will make friends when you're not trying to, and those people will be the people that will accept you for who you are, not who they want you to be.