The sores on her feet sound like interdigital cysts, this can be caused by grass seeds or sometimes the cause is unknown. My own dog suffers from this occasionally and she usually needs a long course of antibiotics to clear it. We found that a six week course of antirobe (an antibiotic used to treat anaerobic infections) does the trick. If this doesn't work or if the infection reccurs the vet will probably want to investigate it surgically to see if any grass seeds are present.
The other problem could be a Pyometra (if she's entire) and should be seen by a vet as soon as possible as this condition is fatal if not treated quickly.
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