It must’ve been very scary for her to be abandoned like that. Bunnies who come from such backgrounds tend to take a longer time warming up; some can even take up to a year or more. But it’ll be so rewarding once they do come out of their shells, so hang in there
I recommend reading up about all things bunny under the BUNNY INFO section of the site.
Is her hutch on the floor or must she be picked up to come out of it? You could also put a few cardboard boxes down so she has somewhere to hide outside of her hutch if she wants to. For now, you could just spend time with her by getting down to her level and sitting near her. Do your own thing and ignore her. Her coming to explore your hand is a good sign and if she comes and sniff you, let her do it but refrain from touching her. You could bring some treats (like a small piece of bunny safe fruit – banana, strawberry etc.) and hand feed it when she comes over, so she associates you with something nice. It could take a while until she gets used to being there.
Rabbits ARE naturally curious, but due to bad circumstances they may harbour some extent of distrust toward humans depending on how they were treated previously. You’ll have to earn her trust.
Also, do work on finding a rabbit savvy vet near you. She probably needs to go for a checkup soon since you don’t know how long she’s been abandoned. As prey animals, rabbits hide their illness pretty well and sometimes don’t show them until it gets serious.