I don't usually weigh in on these sort of questions, but maybe $500 tops. If she were 100% beginner safe (a true beginner could ride her out in the pasture by herself) maybe a few hundred more, but she isn't, so not more than $500. This is the kind of horse, honestly, that I might take on if someone gave her to me, assuming she had excellent ground manners, but I don't think I personally would pay for such a horse.
Also, to echo others, do you mean sell rather than adoption?
"Saddle fit -- it's a no brainer!"" - random person