Here's some details about it:
-It's brown, I'm unsure about what she said the make was.
-It's got some slight wear and tear, but it's better than all the other ones I've tried out.
-It's got a 17inch seat and a medium tree.
-Comes with stirrup irons. [but not leathers]
I wish I could show you all what it looks like but here's a picture of a similar looking saddle I found [in make and condition]:

The leather on the saddle I tried is in better condition than this one, the knee rolls are similar though.
My mom has never bought a saddle for a fair price and she's going to be the one to put an offer to this girl. The last saddle we bought was used and she got it for an absurd price. So I'm asking, what's a good price range to offer from for a used saddle. Any tips?