Besides trying different varieties, cuttings, and/or brands of hay, you could sprinkle a tiny bit of alfalfa over timothy hay or other hay that you might try. If the little bits of alfalfa filter down throughout the hay, that might fool her into thinking it’s all tasty alfalfa, and maybe she’ll eat it.
I agree that she shouldn’t be eating any pellets with colored bits mixed in. Whatever brand you get should be pellets only. Since she is an adult, she should be fed amounts of pellets according to her weight. A medium size rabbit (5 – 7 pounds) would only get about 1/4 cup of pellets a day.
Does she get a good variety of leafy greens? You didn’t mention greens. If she’s not used to eating greens or veggies, go slow, but those are an important part of a rabbit’s diet.
Here are a couple of articles on good veggies/greens to feed:
http://rabbit.org/suggested-vegetables-and-fruits-for-a-rabbit-diet/
https://binkybunny.com/BUNNYINFO/VeggieList/tabid/144/Default.aspx