Ball Python- Nose Rub Wound

[Bogertophis]

...The wound initially appeared as a raised bump and her face seemed to be a little swollen. I have been monitoring her closely now that she’s back in her normal home. The bump went away completely and the swelling went down, but it seems where the bump was there is now an open wound (?) or an open area (similar to when a scab on a human is torn away and the skin around the damaged area is slightly higher than the wounded area) where the bump once was.....

Sounds like a little abscess was causing the bump & then it broke open (or was rubbed until it opened). When snakes keep pushing they often create an abscess, and they don't normally drain on their own (because snakes form pus that's mostly solid), but it sounds like your snake "took matters into her own hands". I agree with advice already given.