Welcome bunny004! Wow, it amazes how many people will put their bunny 'out into the wild" as if it's some wild animal. Through breeding, rabbits have been domesticated and they are not as fast and as wild savvy anymore. I am soooo happy to hear that you stopped that from happening and took her in.
Since she acts out with physically when she's anxious, it might be a good idea to offer new "explore" type toys when you know there is going to be change to help work off her anxious energy. Large Cardboard Tubes (like the ones you can find at home depot for pouring concrete $8, brown paper grocery bags, cardboard boxes etc. and then put them near her cage. If someone is bunny sitting, does she have freedom to be out of her cage. If not, and she's missing out on getting enough exercise, she might be acting out trying to get out her pent up energy. IF that is the case, then get an x-pen and attach it to the pen, and put her toys, boxes and such in there. That way she still can have exercise, but it's limited so she doesn't get into trouble without anyone there.
Regarding her being spayed. The other thing that hasn't been mentioned so far is that nonspayed females have a high risk of cancer in their reproductive organs. Do you know the estimated age of your bunny? If your bunny is over 2 years old, spaying may be more expensive because they do have to do blood work first. And I don't think many will spay her if she over 5 years. old.
It's a good idea to start a saving for her anyway, even if you don't get her spayed, because you may want to prepare for any future vet visit. Vets are just plain expensive when you're not prepared, and if you ever have to deal with an emergency, you certainly wouldn't want to feel like you have to wait and hope things get better because you're not financially able to handle the possible vet visit.
I have pet insurance www.petinsurance.com, and it has saved me over a thousand dollars over the years.
It does not cover any parasitic stuff though like fleas, mites etc. But gi stasis is a common problem which can be a financial strain when not prepared, and the insurance covered that (70%)