Well at 9 weeks old she is still very much a baby so you cannot expect that she is going to learn this right away especially if she is new to your home. I would not even put her outside in the hutch since this is probably not going to help her with learning to use her litter box – I do not recommend that you put your rabbit outside ever.

I guess my question is what is her set-up like in your house when you have her inside.

Yes, she’s growing. You could add some fresh greens to her diet now; a cup of Romaine lettuce, or Green or Red Leaf. Gradually try other greens that are good for them as food or treats, like mint, cilantro or dill. Just be careful never to feed her iceberg lettuce, the kind we eat. It’s bad for her.
If you give her a feeding of greens daily inside in her food dish, she may not eat as much grass outside and learn to go in the litter pan right after she eats.

I’ve heard that you shouldn’t start feeding bunnies a lot of veggies until they’re a few months old. And at 9 weeks, she should still have unlimited access to pellets and alfalfa hay.

This is a good resource:
http://www.rabbit.org/faq/sections/diet.html#babies

I agree that maybe keeping her inside is probably better for litter training, not to mention safer – away from cats and other predators as well as flies and the heat.  Put her hay by her litter box, since most rabbits like to munch and poo at the same time and that might help her get the hang of it.  As for “excessive” pottying…. Leroy is a peeing and pooping machine!  I have to clean his two litter boxes every day.  He’s healthy, but that’s just how he is.  It’s rare in rabbits, but excessive drinking and peeing could be a sign of diabetes.

By the way, welcome to the forum!

I’m always amazed at how quick my buns’ litterboxes fill up. For small creatures, they certainly “cycle thru” quickly.

Your bunny should have unlimited pellets, unlimited hay, unlimted water and being introduced slowly to veggies if she has not had them before.  Bunnies grow so quickly they need a lot of nutrition to keep a healthy weight while growing.

  I recently got a baby bunny (larger breed) and I was surprised at how much pellet he eats (approx 3/4 cup- 1 cup) daily compared to my adult bunnies which get 1 Tablespoon twice daily.

  So eventually the voracious appetite and eliminating does slow down some.  My adult bunnies are always happy to eat though.  They have hay and water all the time- but get 1 Tablespoon pellets in the am, salad in the afternoon and another Tablespoon of pellets in the evening- so 3 times a day they are super excited and are “dancing”, jumping, twirling to get their food.  They can hardly wait for me to put the bowls down.