Hi, I'm Dr. Bob, . . . . . . and I'll be your vet for the evening.
Turning her over to see the so-called infection I was told she has by one nipple. Yep, there it is . . . . . . but it's a mammary tumor, not an "infection".
This will require surgery for removal, probably during her spay, and then a biopsy. Unspayed females are prone to these tumors.

CONTINUE WITH LUCY HERE