Hi there, welcome
1. What a healthy weight is for her really depends on her size. I’ve had buns weighing 2 lbs and buns weighing 9, and both were healthy weights! If you are unsure, your vet can help you determine if she is over or underweight. As far as pellets, I feed about a 1/2 cup total per day, split between my bonded pair twice a day. Their combined weight is about 14 lbs. I’ve been trying to put some weight on one of them (who is about 5 lbs), so I’ve been a little generous with the pellets. You can start weighing Oreo every couple weeks and see if she’s gaining weight. I think this chart is helpful too: https://www.google.com/imgres?imgurl=http://www.therabbithouse.com/diet/images/rabbitweightbodyscore.png&imgrefurl=http://www.therabbithouse.com/diet/rabbit-weight.asp&h=725&w=570&tbnid=Wb6FryOM5P8aYM:&tbnh=160&tbnw=125&usg=__KRfo-LeEMb8u7tdyD1ZmI92ARTY%3D&vet=12ahUKEwis5vnF4OXaAhVGz2MKHWw1CkEQ9QEwAHoECAAQLg..i&docid=If-e2Ug0HdvryM&sa=X&ved=2ahUKEwis5vnF4OXaAhVGz2MKHWw1CkEQ9QEwAHoECAAQLg
2. Fruits are not a necessity, I rarely feed mine fruits. Occasionally I’ll give them a blue berry or a tiny piece of strawberry or banana. Fruits are really treats, so they can be reserved for special times, like after nail trims or medication. A 1/4″ thick slice of banana would be a safe amount. Bunnies with sensitive tummies can get soft cecals with too many fruits, and they can also make the bunny want less hay, so if you notice these things, cut back. Or if you don’t feel comfortable with it, no harm will come to the bunny for not getting any fruits at all!
3. Your routine sounds very similar to mine. I give mine veggies and pellets morning and night. I give the veggies first, then pellets when it’s time for them to go back in their condo. I scatter the pellets around so they have to look for them. And of course hay 24/7.
I feed 3-4 dif veggies per day. Some are staples and are fed almost every week when in season (like romaine and dandelions), and the others depend on what’s available. There’s a full list of possible veggies here:
https://rabbit.org/what-to-feed-your-rabbit/
I have noticed that many of the veggies on the list are all Brassica’s, in the cabbage family: Kale, collard greens, broccoli, kolrhabi, arugula, bok choy, mustard greens, radish tops….
I try not to feed more than one from that plant family at a time, and I usually only give a brassica every other week.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.