Stick with mouse till she is really eating regularly for you and stable accepting food without assist, but slowly go up in size starting with hopper (or what rodent pro calls small mice). Fuzzy mouse is way too small and only makes sense for the type of assist feed where you try to get most of it in their mouth so it's hard to spit out (not quite force feed). If she is biting it herself and swallowing, or even if she makes you put it in her mouth but doesnt spit it out, it doesn't need to be so small. I wouldn't mess with switching to rats until she is eating regularly and looking the correct proportions because its easier to switch if you can let them refuse over and over rather than having to go back to what they are used to.
If she refuses, I wouldn't go assist feeding her every week the way they have been. Unless she is pretty underweight (and I mean she actually looks skinny, not just small for her age), she can go a few weeks without food and it might help her want to strike on her own. The sooner you get her doing it on her own, the better.
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