HI there Walt...
I can understand your wife wanting instant relief for your girl. The stress she's under also put strain on the adrenal's which are responsible for the production/release of hormones and including the body's natural Cortsol...this leads to adrenal burnout...further taxing immune system so for temp solution it's the right thing to do.
(a natural steroid'ish' is Licorice Root...some literature says "DGL" version.(some component removed to do w/blood pressure)......
anyhow...couple things now that she's on abti'B's AND had a steroid shot on top of an already compromised immune system...on top of hormonal release from stress your going to have to help her out a bit...
Definately give her a Probiotic but not w/abx...get a good quality from the refriderator, not shelf stable one....away from food away from meds.
Suggest a D-zyme w/pancreatin
a broad spectrum mult vit./min. mix, one that contains anti-oxident blend too, like a greens plus for dogs...this will help detox/strengthen...
At least these three...no 4 - KELP, not meds. and if not doing green mix... if it's functioning but sluggish...NOURISH...meds. will eventually lead to lazy thyroid and will loose it's function and will need meds. for life. Ashwaganda is a safe herb and indicated for thyroid/adrenals as well stimulates the immune system and is calming (for the stress, good for sep. anxiety),
Contact the Holistic vet sent by Mom's...even if too far, they could recommend, or consult w/your vet (hmmm???) or at least suggest qualities to look for in a holistic one and costs...you have a few weeks for the derm...research (I know you are overwhelmed)
Holistic offers hair sample testing for heavy metal/mineral toxicty...like aluminum, mercury, zinc oxide...Enviromental!!! conventional testing (scrapings) just signals a possitive result and calls it an allergy (which is fine for food testing) but doesn't determine a toxicity!...there are vitamins and things like apple pectin that bind toxins and remove from the body...give her apples - organic if keeping skins on...great treat! NO seeds they have traces of arsenic!
I think I had one more thing but it will come later.
Now I am not suggesting the herbs as a "you should do" and you don't want to jamb it all in her...so Consult w/an Integrative Vet DVM...I am only suggesting to show you there are usually options...Skin issues are a gold mine for steroid companies!
I do however suggest at least do the first two...d-zyme and probiotic you don't want to run the risk of another poop problem - loss of nutrients, body gets weeker.
Not sure about a good "doggie greens" but I'd stay away from soy.
Keep us in the loop...it's kinda like a journal of what you did for your dog and when!