I would gradually decrease the pellets at first until you start seeing her eating hay well. So maybe start with a half cup, then see if over the next week, she starts eating hay better. If she does, then depending on how big of a rabbit she is, stay at 1/2 cup or reduce to 1/4 cup. Recommended pellet amount for pet rabbits, is about 1/4 cup per 5 lbs of ideal body weight, though that will vary depending on your rabbits metabolism and individual needs. I would gauge the amount of pellets to feed based on if she's eating at least a pile of hay the size of her body per day, her being able to maintain a normal body weight, and her producing healthy looking good sized fecal poop.
https://rabbitsindoors.weebly.com/pellet-food.html
If she gets to eating a pile of grass hay the size of her body when also eating a half cup of pellets per day, is maintaining a good weight on that amount, and has healthy looking poop, then that's the diet I would stick with. If she isn't eating a pile of hay the size of her body per day but is maintaining a good weight or is overweight, then I would decrease pellets again, to 1/3 cup per day and see how she does on that, checking body condition once or twice a week, to make sure she doesn't start to lose too much weight and get skinny.
http://ontariorabbit.ca/wp-content/uploads/2015/02/BCS_Rabbit_Final_Approved.pdf
Make sure the hay you're feeding is good quality horse hay(no mold, no noxious weeds, not too dusty, not too sunbleached). If she still won't eat the hay you're using, it might be worth trying a different kind like others have mentioned, like timothy, orchard, oat, bermuda, rye, etc. or a different cut of hay like first, second, or third cut. Some rabbits prefer a crunchier more mature hay like first cut, some a leafier hay like second or third cut. I prefer a second cut that is a mix of leaf and stem.
But you also have to balance protein levels and fiber in a rabbits diet. First cut grass hay usually is hard stems with more fiber and less protein, second cut is usually a mix of leaf and stem and so a good mix of fiber and protein, and third cut is usually leafy and has more protein and less fiber. Too little fiber and too much protein in a rabbits diet can result in weight gain and/or slow digestive function. Too little protein and too much fiber could result in too much weight loss and nutrition related health issues. So it always has to be in balance.
If she still won't eat hay despite trying different types of grass hay, and/or she starts losing too much weight on the decreased pellet amount, I would suggest getting her teeth checked by a knowledgeable rabbit vet, like Diane R suggested. Rabbits can get sharp spurs on their molars like horses can, and it can affect their ability to eat hay and sometimes other foods.
Medirabbit: dental issues
Vet List | House Rabbit Society
For toys, my rabbits like fresh willow and apple branches, willow toys, and a cardboard dig box filled with crumpled newspaper.
http://www.medirabbit.com/EN/GI_diseases/Food/Branch/Branch_en.htm
