post botfly removal/breathing problems- Vetrx?

Well, this hasn't gone right. Our barn kitty, Ginger, is about 10 weeks and 2.5lbs. The botfly breathing hole was closing up and looked more scabbed this morning, but kitty was enjoying a ground squirrel and acting just fine. Three hours later we came home from the fair to her laying behind a planter with a slight raspy inhale. I called a vet and decided to take her in. The botfly breathing hole had closed up and the larva was dead. Kitty's breathing got really bad while at the vet; she'd go through bouts of really labored inhales. She's had sedative, antibiotic, steriod and benadryl (I think) and we left her in the oxygen cage at the vet for a few more hours. She'll come home wether she's improved or not; we're all thinking the oxygen isn't benefitting her at this point.

The labored breathing is from swelling, per the vet, swelling from botfly irritation on her trachea, or allergic reaction to toxins from the dead larvae. I wonder if some vetrx might help her? She's only mouth-breathing currently. Maybe some Eucalyptus EO in her overnight crate? I don't want to wake up to her dead. Poor little Ginger.