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I am sorry to hear about Weezer having MRSA. You should ask your veterinarian for mupirocin ointment to use topically on the wounds; it is effective against MRSA. It is by prescription only.
This might be a lost cause, but I would not be ready to give up if she is eating and playing.
Let me know what else I can answer.
Usually MRSA is a skin infection, and found in the wounds. Treating with mupirocin may help.
Surgically "debriding" the wounds, cutting away as much as possible may be helpful.
For immune support, healthy food and reversing her malnourishment would be most important. I did some searching and research and can't find any specific ways to boost her immune system in MRSA cases. Being on antibiotics shouldn't lower her immunity or affect the function of her immune system.
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