I've never owned a jelly toy, because I've done enough research to know that the material isn't safe or sanitary. Various reviewers can tell you that it smells bad, breaks down, and harbors germs like crazy, among other things. Many jelly toys also contain phthalates, controversial plastic-softeners that have been banned in some areas (especially Europe) in children's toys.
I own the elastomer version of the Rabbit Habit. It works great for me, is phthalate-free, and is made of a better overall material. I would highly recommend it, especially since it costs a lot less than the one your GF is looking at. I swear by silicone, and most top-of-the-line silicone toys don't cost $112. They'll also last forever and can be boiled and run through the dishwasher, but there aren't too many proven silicone rabbits out there. If there are, I'd love to hear about them.
If your GF absolutely has to have this toy, make sure that you at least give her some information on phthalates and how to care for jelly toys:
60 Minutes article on phthalates
Eden info on caring for jelly toys