Why are these people getting rid of her? Do they just not want her anymore or are they going to keep her if you don't take her? If you don't take her and they still want to place her, will they be as picky as you would be with a new home?
From a breeding/collection standpoint, I can understand why you might not 'need' another female - and a normal at that. But from a snakelover's point of view, I know I would want to help this snake out. Seems a shame for her to have been so well cared for for the last 4 years and then not go somewhere where she'll be equally well taken care of. Just a thought....