Wanted to update on the mare. Her abcesses drained, closed up and seemed to go away. Then swelled up to about half a golf ball size, drained only a small amount, then closed again.
It has been completely closed up now for about a week. To be honest with you I can't tell if the lymph nodes or normal sized now or not. I have never had any reason to shave a horse's throught all the way down and study it, so have nothing to compare to. The lymph node that had been swollen is only very very slightly larger than the other. There is also a tiny lump about 2 inchs below the right lymph node that looks like a small marble under her skin and it pretty soft.
If nothing else happens I'd like to have a nasophyrangeal (sp?) swap done of her in the next couple weeks to see where we stand.