It’s great that Hope is eating a lot of hay. APD is good quality hay. Both the high fiber and the second cutting Timothy Gold are favorites with my bunnies. Some rabbits are fed a pelletless diet, but to make up for the lack of vitamins and nutrients they may be missing, you are supposed to feed them a great variety of greens/veggies each day. Something like 15 different varieties, which may be hard to accomplish, plus being expensive and causing you to spend more time prepping the veggies.
Sometimes when a rabbit stops eating a particular food, it can be due to teeth problems, but it sounds like in Hope’s case that she was eating pellets before due to not liking the Kaytee hay and now that she loves the new hay, she isn’t interested in pellets. Is she still eating her greens as before? If you do see her having any trouble eating hay or greens, you should have her teeth checked out.
You can try scattering her pellets in the hay to see if she will eat them that way, or you can go ahead and try a different brand of pellets. Both Oxbow and APD are very good products. I’m not sure that Small World is as good.