What did you try soaking her in? I would try soaking in 80-85º water for 20-30 minutes. Put her in a plastic tub with holes on the sides. The water should only come up about 2/3 of the snakes body, so very shallow water. I like to add a few crumpled pieces of paper towel in there so they have something to grab onto.
That should help loosen things up. I wouldn't worry too much unless she stays like that for another week or two. Is it possible she might shed soon? Sometimes they save their poo for when they shed...who knows why.