OK I notice you said your rabbit was a girl. Which is kinda funny because I had a girl rabbit and she was usually up at night. I know you might not feel comfortable "forcing" her out of her cage but that is what you need to do since she is gaining weight. What you do is you pick her up and put her in an area she can run in. I let my rabbit run on the porch. Also put the following items out with her food, some water, and some cardboard. Rabbits are pretty easily entertained. And let her have some free time every day. The more you do it the more she will look forward to it. Good luck! :)
Bunnies usually are lazy, however, if you have other animals in the house this may be why. Also, maybe you should get her out more and play with her, she might be afraid, of interaction with humans. If you can move the cage, I would definitely take her outside on a nice day and let her get some air. Good-Luck
I leave my Bunn's cage open when it's time to play out of the cage. I don't sit and wait for hi to come out. I simply say, "Ok, Bunny, time to come out." Then I turn around and continue whatever I was doing. He comes out and explores at his own pace. Rabbits don't like to be forced into things. They typically enjoy when you mind your own business until they are ready for you to approach them. They can be very strange at times. Lol
Rabbits (we had a ten pounder)By rule the don't like to be held .Is your cage above the ground in a hutch?if so or not make him/her feel real secure. Hold him to your chest and support him with one arm underneath,set him down and reward him with a good rabbit food.If Cage is on ground keep the door open tempt rabbit with treat outside his door.With time he will come out let him run around in a SECURE area he will be happy and healthy ok?
Maybe she didnt get an-of interaction with you try leaving the cage door open if its on the ground let her come out herself if not I know this sounds bad but temp her to come out with some hay or something like that anything she likes hope it helps
Help, my bunny will not come out of her burrow!
I don't know I have a new bunny and she will not come out to I see your problem, also wait untill shes close to the cage door and open it, if that dosent get them out then I don't know what will.