what are you bedding her in? If it is anything but pelleted (bunny food or cellsorb or yesterdays news) get her on pelleted. The less dust and wood the better and some of her symptoms may resolve with that.Get her into something with clean bedding (as above) and good airflow. Get her out of any dust, any perfumes, any airborne cleaners, cigarette smoke....ANYTHING that might irritate her. If she is having trouble breathing....try ONE chocolate chip....NOT more. If you are more worried than a bit of chocolate brachiodilation relief will buy, but can't get her a decent vet IF IT WERE ME....I would try some echinacea and goldenseal herb tea....mix it with honey or yogurt and she may take it. The yogurt is a good idea anyway as it will help hydrate and keep her strength up. I personally have used kids cold meds...cherry flavored, liquid.....NOT alcohol one.....like couple 5 drops. Comfy, low stress. You may be dealing with a virus and not a lot will help and she may have to ride it out. Or it may be a myco flare up and all of the above will help some. IF you could get a vet to get her baytril or other antibiotic in a nutrical base that would likely be best. I mention the nutrical as it is something some vets don't think of and it is a good way to get them to take their meds. Obviously I am not a vet, nor do I play one on TV. But I have had a lot of rats and met more than my share of unhelpful vets.
-----
Sonya
Haven't we warned you about tampering with the structure of a chaotic system?
Mrs. Neutron