Lucky escape.
If £2k is the top of the budget and she had to borrow more to get to the £2.5k then its a lucky escape!

An old 5hitter Fiesta turbo for £2k is going to cost you a load to make it decent ie once you get it home and find out all the hidden problems its got.

Save up some more or buy her a nice Puma or something that is nice to drive and wont cause endless problems to keep it on the road.