As bad as I hate to say this, alot of people dump their sick pets at the pound instead of taking care of them. I just hope it is not to late for your baby. I am thankful for people like you that care.
To be sure, it's probably best to take her to get both tumors checked again, a needle biopsy should do the trick. And get her bloodwork done.
It's possible her swollen legs and fluid leaking there isn't related to the tumors. It could be a form of infection. That's my guess.
But it's no good just going off my guesses. Take her to the vet to be checked out.
My dog has 4 breast lumps. All benign. I have decided not to put her through surgery for them as they don't seem to be causing her any trouble.
Before she was spayed, one of them DID make her nipple leak a pinkish fluid, yet the tumors were ALL checked and found to be benign.I'm saying that effect CAN happen even if the tumor isn't cancerous.
But beware because some can mimic benign tumors....some can be a combination of both benign and malignant....some (even harmless ones) can put pressure on surrounding tissues, blood vessels and nerves.
It is always wise to have them needle-biopsied, and again at a later stage if any changes are noted.