I’m just switching my six-month-old Holland Lop onto his adult diet, and before that, I fed him Oxbow Young Rabbit essentials and grass hay. The recommendation is unlimited pellets at this age, but in my opinion, it’s also important to make sure that they’re developing healthy hay habits. If they ignore their hay entirely in favor of pellets, it’s probably best to cut the pellets back a little. I ended up giving him about 1/2-3/4 cup of pellets each day. He now gets 1/4 cup split into two feedings, and I may cut him back to 1/8 cup, depending on how much more he grows.
With that being said, even though hay is definitely the most important part of rabbits’ diets, I would strongly recommend you keeping her on the pellets, even if you don’t feed her an unlimited quantity. Pellets have essential nutrients that hay doesn’t, and while some people do feed their rabbits a pellet free diet, they do so by giving them a large quantity of vegetables with the nutrients that they would otherwise get from the pellets. While this may be something you want to consider further down the road, now is probably not the right time. Check out this article from the House Rabbit Society: http://rabbit.org/pellet-free-diet/. I’m not sure how big her bowl is, but since it’s for hamsters, I’m guessing it’s small. I think you can probably get by giving her more pellets. Can you get a sense of how many cups of pellets she’s getting?
As far as the alfalfa/timothy goes, I mixed it initially, but stopped when I noticed that my rabbit’s poops were a little wetter. I attributed this to too much alfalfa in his diet from both the pellets and the hay. It immediately resolved itself when I took the alfalfa hay away. That might have just been my rabbit, though, so I’m not sure about yours. If you have the alfalfa already, I don’t think there will be any harm in mixing it and seeing what happens. I probably still wouldn’t mix the hay 100% of the time, just so that she still develops a good taste for timothy and isn’t resistant to eating it when you cut the alfalfa out entirely.