"...a bulge on both sides of her jaw line, at the bottom of her dewlap (going into her neck)????"
Sorry, I can't picture that.
I wish there were more detail in the description, or even better, a photo.
I'm assuming the swellings are all on her dewlap. One cause for lumps and bumps in dewlaps is un-trimmed toenails. The needle-like points dig into their skin when they get a toenail caught on their dewlap, causing small infections. Watch those swellings closely. Hopefully they will heal on their own.