Hi Lulu....

you poor love .... big hugs.

The other girls are so right there is nothing you can do about this and you just have to ride it out.
But by all means MAKE A STAND - she's going to do it anyway but you don't have to make it easy for her.
so the next time she wants a lift to the shopping centre or her friends .... point her to the bus stop

I can't imagine how hard this is for you so good luck xoxox