She's such a tiny little thing. It's possible infection is overwhelming her. Her chances at this point are not very good. You've done all you can do with the meds you've give her. There isn't anything more to be done on that front. But maybe she can be revived with warm sugar water every half hour to raise her glucose level and get some fluids into her. She's in a crisis, but don't give up just yet.
Warm one cup of water to just below 100F mix a teaspoon of sugar into it. Starting now, give her .5ml of the sugar water every half hour until you go to bed.