At this point yes I would assist feed to get her back going again, IMO given the original weight this animal was probably not consistent to start with.
Once she get assisted leave her alone same as before, and next time you try feeding again, place the BP in a brown paper bag with a large fuzzy mouse (eyes still close), close the bag and place it in the tub leaving them both together overnight. Hopefully this will work, I would also clutter up the tub with lose crumble newspaper.
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