Why not just borrow a bike or rent one for the event? Seems like a more economical way to go. Heck visit your LBS and ask them to sponsor her for the event by letting her "Demo" a bike for the race. While in the pits, you could have a "For Sale" sign on the bike, with a lowered price for that bike after the event and the name of the shop where you could buy a similar bike!

Our shop has done this numerous times. We had a co-worker participate in an adventure race and used a full-suspension bike for training and the event. We now have her bike on sale at a "demo" price, and the bike is still flawless! We'll sell it just above cost, so we won't loose money. The owner will write off the lost revenue, so it's a win-win!

L8R