It's hard when a frog won't eat. All I can suggest is trying gently to put something between her "lips" so she opens her mouth, but you said she's too small for a card? I have a fairly small tree frog that I use only the corner of a card for. Is she showing any interest in prey at all?
Leaving her alone when possible seems like a good option.
Do you use distilled water? That could be a source of bloating, though really it could be anything.
I'd suggest ReptaBoost for a frog that's lost a lot of weight although there's a cost factor and also it involves getting a frog to open its mouth.