Lol! Ok yeah, she's a littler chubber. A cute one though
So I don't know if this is what's going on with your rabbit, but I may have discovered why my rabbit's been guzzling water, and thankfully it's not a health problem, particularly kidney disease. I've only had him about 2 months. All of my rabbits have been on a no pellet diet for a while now, but this new guy was basically on pellets for most of his life, and he's 5 now. So I wanted to get him off pellets and onto hay, leafy greens, and forage like the rest of my rabbits(who by the way all drink normal amounts for their size), especially because his soon to be bunny wife wasn't on pellets either so I wanted them on the same diet.
Over the first month he was with me I got him neutered and was gradually reducing his pellets and trying to get him to eat hay, which he wasn't good at(he was drinking normal amounts at this time). He would nibble some hay but was reluctant to eat much of it. About 2 weeks after his neuter I noticed he was emptying his 3L water tank in about 2-3 days, something that should have lasted him 2 weeks. At 4 weeks post neuter he was completely off pellets, bonded with his bunwife, and was draining most of the shared gallon water tank in 2 days(and peeing everywhere). I thought that maybe it was his teeth that were causing the increased thirst, but he seemed to be eating hay really well(his poops were perfect). I was most worried that maybe the anesthesia from his neuter might have caused kidney damage. He was being treated at this point with antibiotics for possible cystitis as well as a URI, and fenbendazole for possible EC. I wasn't really seeing any improvement.
Well with the increased thirst he's been losing a lot of weight despite eating loads of hay. I started supplementing with black oil sunflower seeds to try and boost his calories and stop the weight loss. I finally decided I needed to also get him back on a concentrated feed as he was needing a ton more calories than he was able to get from hay and forage alone. I started him back on pellets yesterday. Last night and today the excessive drinking and peeing has stopped. Like stopped completely.
Now, I'm fairly familiar with rabbit health problems, and I have to say this is one of the strangest things I've encountered. I have never seen nor heard of an instance where a rabbit has dramatically increased water consumption because of not getting pellets. I haven't figured out any sort of explanation yet for why this happened.
I know it's only been two days, but he's been guzzling water for weeks, and all of the sudden it stops when I put him back on pellets. It's not like rabbits can't do alright and be healthy on a no pellet diet. My 7 other rabbits haven't had pellets in probably over a year and have been perfectly healthy in that time. In fact I've encountered less stomach upset incidents since removing pellets from their diet. And even before that, for several years they only got like a tsp. of pellets a day. So it's just something about this new rabbit that a no pellet diet isn't going to work with. So I guess this means I'm feeding pellets again... much to my rabbits delight I'm sure
Now with your rabbit, if I understood your post right you took this new bun off pellets and put on a hay and veggie diet? So, I don't know, but maybe pulling her off pellets has had the same effect that it did with my rabbit and that's why she is drinking more than seems normal. I think this would only be a problem if she is drinking so much it's depleting her electrolytes, and if it leads to excessive weight loss like it did for my bun.