Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Any changes, sores, or signs of infection around the head, in the mouth, the forefeet, or down the front brisket?
Are you seeing any other swellings at the armpit, or just below the back of the knee?
Does she have a fever, any breathing changes to paling of her gums
Can you take a photo of this to let me see what you are seeing? To post a photo, you can use the paper clip button on the tool bar above the text box. Or if you cannot see that on your phone/computer, then you can post them on any site (ie Flickr, Photobucket, Imgr etc) and paste the web link here for me to have a peek.