I have had this horse for a year and this is the first time she has had any hoof problems. Further, I know the previous owner very well, and he had no problems. (I am not going to count the time she stepped on a simplex nail that had somehow gotten into my barn. She was sore on her foot for a few days but that cleared up quickly. This is a different foot than the nail foot.) I am not sure what number of abcesses makes a horse "abcess prone."
My farrier is coming out tomorrow to check if it is a leg problem or hoof problem. I am taking the advice of letting the abcess work out on its own. I will not stall her during this process. Since I don't ride her often, I can let her heal for a few weeks.
Thank you all for your comments.