Thanks for the info so far!
I haven't offered her anything because I would feel way too guilty if I shorted her by any amount. It's really in very good shape, just dirty.
I will make sure she doesn't just throw it out, even if I have to scrounge up some money for it myself and sell it later to make my money back.
I live in such a rural area that craigslist doesn't really exist here. No one sells Singers around here...the few times I see them are at flea markets or antique shops and they almost always want $200+ for anything even remotely close to being as nice as this one, no matter the model. Plus I'm sorta clueless to these things. I have a Slant-o-matic that was given to me for free, I just have to get it to my house..no clue anything about that machine either.