Definitely. I know there is something called the 'Lemon Law' here in the states for car sales where, if you take it home and there's such-and-such wrong (I don't know all the details) you can return it to the owner and get your money back... at least, that's how I've heard it.
I also think there are some things in that same vein that can be done about people taking advantage of the intellectually impaired. Is there nothing she could do or have someone do to get her money back as she was taken advantage?
I guess, in the end, it would be difficult to prove.