Fake an accident outside her home, hope she sees you, thank her for saving you by paying for her trip.
But then I'd need someone to ram a car into me. Also someone to potentially ruin my other leg. Theeen I'd also need cops, an ambulance, and a gang of armed drug lords to threaten me.
You're going to have a hard time with it, not making her feel bad, poor, anything like that.
You need a plan. Get your friends together. Come up with a story, so and so's cousin was going but dropped out, we've got a ticket now and nobody to give it to. Hard part is making her believe that, and it'd probably be best if another friend offered the ticket to her and not you, otherwise she'll be right back to the conclusion you bought it.
Problem is white lies don't always work out like you planned.
But the thing is she already knows we want her to go, and already know that no one else was planned to be coming with us but her, annnd we don't have tickets. We literally hand money to a person, and we get tossed outside inside the cold, notsohard snow, and ski.