If she is just shedding alot I wouldn't think it's mange. Usually the reason people get their dogs checked is because they notice bald spots.
If she's acting normal I wouldn't think it's anything to worry about at this time.
The bump could be anything, I would just keep an eye on it.
Five days isn't that long, just tell the people that are going to take care of her about the bump and have them check it daily. Can you call and check on her while your away?
Sandy, Koke and Lelaska's Mom