What will her set-up be indoors?

Does she have a litter box now? Is she spayed?

Also for now I would take any bedding out of her space and put a litter box with rabbit safe litter in a corner and add hay on top of the litter. That will get you started – does she currently use one area now to poop and pee in?

Remember you may have to retrain her once she gets moved inside as well – very happy that you are doing this.

i think you should move her inside first, esp. if she might be pregnant.  there is no point in allowing her to get “settled” outside and then disrupting her by moving her in then.  she will be less frightened inside b/c there are no predators like there are outside.  and  this way you can keep an eye on her.  put her in the pen with a litterbox with a layer of hay.  bunnies usually catch on pretty quickly, esp. if they are a bit older. spaying will definitely help, but many unspayed bunnies will get the idea too. i will say that urine tends to smell more when they are unaltered, so you have to be diligent about cleaning the box often (probably every other day.) if you put the pen on linoleum, it will be easy enough to clean up any accidents too.

read some info about littertraining, and show it to your mom.

https://binkybunny.com/BUNNYINFO/LitterboxTraining/tabid/62/Default.aspx

http://www.rabbitnetwork.org/articles/litter.shtml

http://www.bio.miami.edu/hare/training.html

spay and neuter:

http://www.bio.miami.edu/hare/spay.html

if she is in fact pregnant, you will need to read about what you need to do…

http://www.bio.miami.edu/hare/surpriselitter.html