Quick answer please-should I just leave

[Brokentopieces]

Long story short, I'm travelling to another town 2 1/2 hours away for a friends birthday. There's 3 of us going and we decided to travel together to save money (were all skint) so anyways the girl who said she'd drive (me and the other girl had car problems) has not changed the leaving time by at least 2 hours which will leave us bearly any time to get ready, have a few in the house..... The problem with my car is the wipers broke but my dad has just offered to fix it for me so me and the other girl can leave now. We were supposed to have left by now anyways.
I knew we wouldn't leave on time because my friend is bad at time keeping but 2 hours is crazy. WIBU to get my dad to fix it and leave? This means the other girl will have to pay full cost of travelling. I'm just so pissed off and feel if I don't go she's gonna think it wasn't a big problem. If I had known the new travelling time I would of got a bus or made sure my car was fixed

I would suggest to her that is what you are going to do, that way you give her the opportunity to avoid the extra cost.
I would drive myself but I am not very good at relying on other people.

Why can't you fix the car and all go.. is it a 2 seater?

Yes, leave. But text the friend first and offer her the choice of coming with you.

Phone her now say your wipers are being fixed and you'll be leaving at exactly x time. If she is ready at x time you will take her /or if arrives in her car then you'll go with her but you and friend do not want to go 2 hours later than planned.

Why post on here, just get it fixed and go?

Do you really need strangers to tell you what to do?

I think it would be quite mean to just go without her. She offered to drive when neither you or your other friend could, presumably you were paying her fuel money if you were all going together "keep costs down." She might not be able to afford the journey on her own.