It’s wonderful that you decided to rescue a bunny. There are so many that need homes and are abandoned every year.
Bonding with your bunny takes time! Most likely she is scared and uncomfortable in a new environment.The rescue I got my bun from advised it can take 4 – 6 months before a rabbit becomes settled in their new environment, but I’ve heard of it taking longer.
In my opinion, 2 weeks is too short of a time to make an informed decision. Also, most rabbits are not lap bunnies like a cat or some dogs. They very much need to control their space and how they interact with others. That has been the hardest part for me to learn. I need to let my Jack decide if he wants me to pet him or not. If I force it he will become frightened and then aggressive in order to protect himself.
The first thing to do is to rule out any health issues – pain can cause aggressiveness. Is the rabbit neutered? What type of habitat have you set up? How much out time does the rabbit get and what do you feed him? Are there any other pets or small children? All of these things can play into an aggressive rabbit.
And your rabbit may very well be missing her former foster mom and is sad and scared about that. That will get better with time.
This article really helped me with my shy bun: http://www.bio.miami.edu/hare/shybun.html
And here is one on aggressive rabbits from the House Rabbit Society: http://rabbit.org/faq-aggression/
And for an anecdotal quick story – it took just about a month for my bun to begin to relax. The first few weeks were really scary for him and me. I didn’t understand his behavior (I’m still learning!) and he hated my clumsiness (he still does). He spent a lot of his time hiding, or sleeping crouched in a ball. He would play, but avoid me for the most part. He was scared to jump on the couch (he’s small) or even run too fast. Finally after a month, I saw him flop and I knew everything would be ok. He know easily gets up and off of the couch, sleeps in all positions and interacts with me when he plays.
He still grunts at me sometimes when I feed him and occasionally boxes if I startle him by reaching into his area, but these things aren’t serious. He’s just communicating with me. I’m looking forward to the next few months to see him come out of his shell even more.
I would advise just keeping her fed, and in a clean space with the recommended 4-5 hours out time every day. When she’s out sit on the floor and read a book or watch TV or something and ignore (or at least pretend to) her. Eventually she’s going to get curious about you. And in time she will realize you cause her no harm. Do you have treats that she likes that you can bribe her with?
I hope you reconsider returning your bun. She may just need more time to get to know you and your home. Good luck!