First, she s mean. Don't let it spoil your break, rise above it for ur own sake and for the others u are going with. Do they feel uncomfortable about it?
Second, she s probably jealous and feels the others are more friendly with u than with her. That's her problem.
Third, once u come back, don't be so accommodating to her, she s using you. Have a reason practiced so you can't give her a lift, e.g. No, I'm going somewhere else after this so I can't take u home. Bloody cheek of her!
I'd be stewing over this for ages, I'm too sensitive . But have your holiday first then either say something in front of the others " why couldn't u fit me in your big car." Because if u don't address it, it will fester away at u. I regret things I didn't address and years later I'm still thinking about it. Say it calmly, and let her know her behaviour was out of order. She s the nasty one, not u.