If she has hip bones sticking up then get her eating as priority #1. If she has even a little fat then she will be fine for a few days. She doesn’t look skinny from the small amount I can see if her in the pic. Hard to tell without a back end and/or tail pic. Sometimes less is more with new and/or stressed rays. She doesn’t have to eat right away but missing even a little of that extra food can cause an issue.Should I still be trying to feed 2-3x daily if she’s not taking it?
Once you get her eating, up the feedings accordingly for what you want to feed.