hi websa i read your problem as you described it on another website.
the issues are serious and complex. the fact that the woman directly transferred $150000 into your bank account would surely prove a link to you? she has a mental illness so it could be argued if she signed a contract when unwell, it would be not valid. her family have power of attorny so they are now in control and have protected her interest by the caveat on the title.
a sad and sorry tale.
it does not sound you have risked much of your own money? legal advice will be required for all parties i would think.
are you still marketing the project?
good luck and i hope an optimal outcome for you all.