WHAT DO I DO?!?!?!?!

i have a problem my friend wants to go out with me for lunch but I don't want to and every place she wants to go is far and we most likely won't make it back to class on time so idk what to do and she can't be talked out of going to these places I have tried and we will have to walk which I am fine with but she doesn't walk that fast so we probably won't get there till we have to leave and I her mom is the type to not let her go places away from where she was dropped off like if we go to the mall we can't go to the movies next to it we have to stay in the mall so I am afraid that if we go and get caught or her mom finds out I will be blamed and get in the most trouble and she never knows what she wants so that just adds less time to the time we have to get back I have been out with friends before but they don't have these problems they know what they want, they walk the samespeed or faster then me and we only go across the streat.idk what to do i don't want to go but there is not getting out of it.