If she's thriving on her current diet I wouldn't make any changes to it. At least not right now. Moving homes is a big enough change.
My cats go through stages of liking certain flavors and certain foods. Although, if I only fed them one kind all the time I' sure they'd eat it if they were hungry enough.
I use Tidy Cats litter and have found I like it the best. Almost no dust and it clumps better than any I've tried. Plus there's no harsh perfumes in it.
I just ordered the Litter Genie and I'm excited to see how it works for me.
You're doing great, Sally. Cinders sounds like a purr-fect fit for you!