You are not terrible at all. That is what I and most others would do at her age. The likelihood is that it is jsut a cyst anyways.. that would be my guess. My parent's 14 y/o lab/BC mix has them ALL over and in the beginning we took him in but now they just leave it.. he's too old to be going through all that.
IMO you are doing better by her doing it this way and she would appreciate that