Michelle
That is great news. The recovery has begun for your mom. It is time for you to relax, not go crazy. I am going to go out on a limb here. Most likely, the only way the surgeon would have said he had clear margins is if a "Frozen Section" was done during the surgery. That is, a pathologist would given a preliminary report during the surgery, confirming the margins were clear. Relax and enjoy the good news and the weekend.
Bill