Aw, that is so sweet!
Yes it is amazing how interactive and wonderful rabbits can be as pets. They are every bit as affectionate and interesting as dogs and cats in my opinion, if given the chance!
If you are in the US, the house rabbit society (rabbit.org) is a great network for adopting rabbits in need. They have chapters around the country that you can look up. I got my bun from an east coast chapter of HRS and they were so helpful and welcoming. It is especially nice to be able to adopt adult rabbits who have already been spayed/neutered and have developed their adult personalities. If you are in another country perhaps other members can recommend resources?
And I’m glad you have developed a good bond with your current rabbit! Even if you do have to give her back, perhaps you can help improve her environment and educate others while she is at the school so she can live the best possible life 