I got my rabbit about a month ago too! Several questions for you. Is your rabbit spayed? Spaying your rabbit will help with behavior, litter training, and prevents cancer. Second, is your rabbit in a cage, or in a pen? Keeping a rabbit in a cage is definitely not enough space and can make them unhappy. If your rabbit is spayed, litter training her will be pretty easy, they can learn very fast. Make sure the litter box is spacious, your bun should be able to turn around in it, ones made for cats work great. Next, set up the litter box with a liner, some sort of bedding, and hay. Now when your rabbit begins lifting their tail, it means they have to go, so if you notice this behavior, pick her up and place her in the litter box. Rewarding her with treats always helps! Some rabbits don’t even acknowledge what litter boxes are for, I had to place my rabbit inside before he realized he should sit in there. Because your rabbit seems unhappy in her environment, I would surround her with things she seems to like, like fun toys. One month isn’t too long, rabbits usually take a bit to warm up to a new family.