[cycleguy55]

I'm not a lawyer, so keep that in mind, but my view is that if she has been certified as 'mentally disabled' it may be possible to have the sales and loan agreements voided. The argument would be she is incapable of understanding such agreements and the dealership took advantage of her. Similarly, the bank should know better.

It would seem the level of mental disability or impairment is critical, so legal advice would be valuable - but it seems to me there's a reasonable probability of having either or both of the sales and loan agreements voided.