Welcome to BB forums. I’m sorry to hear about your recent losses, but it’s very endearing to hear the care and love you put into talking about them.
I have never had non-rabbits, and I know there is a good overlap between the two, but where they diverge, I’m unsure! Some things that come to mind for me, based on what you’ve provided:
Diet: Rabbits have very sensitive stomachs, so if you introduce non-hay items, like different vegetables and treats, always start with a very small quantity and observe for the day to see the reaction. It’s all about keeping the bacteria in the stomach healthy, and if there isn’t good gut flora in there to digest what has entered, your rabbit may become gassy, and this can vary from being a temporary state to one that prevents eating. Slow transitions are always recommended.
I think pigs eat a lot of hay as well? So the same is for rabbits. The large majority should be hay. Boost hay appetite and consumption by lessening access to non-hay items. Usually people do a 12-hr window deal. For example, 7AM is veggie plate, and 7PM is pellet dish. The rest of the time = only hay access.
Being 5 months old, she’s at a diet transition period. She can probably be on limited pellets, meaning usually 1/8c to 1/4c, depending on her weight. Things should be timothy-based as well, and not alfalfa-based.
Introduction of veggies should be done slow, so in a way it’s good she’s not gobbling things up crazily. Romaine/green/red lettuce are usually the baseline, first introduced veggies. I’d say the next nice step is mint, basil, and cilantro.
Litter Box training: I’m a bad person to comment on this because, is Wick litter-box trained? Yes. Is he adherent? No. For me, it’s a constant learning process, but he “got the concept” that I like him going in there after 2 months I’d say. Slow, resistant learner.
Spaying: It’s very natural, especially with your experience, to be hesitant about spays. If you have a rabbit-experienced vet who has a record of spaying, the risks are not very high, although spays are more invasive than neuters.
Anesthesia: Rabbits can have teeth issues when hay consumption is low, or if their bone structure is bad (poor breeding, genetics…). Wick has a tiny face and bad genetics, so he needs his teeth grinded very often. The procedure is under anesthesia (not long, 15 minutes, but still under). He’s had it done 13 times, so it is very possible to put rabbits under and they recover afterwards. The field has come a long way, and a big part of the success is finding a good vet. Ask questions about experience!
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.