The scooting may be due to another area irritating Meg.
I have had this problem with Maddie. I asked the breeder about it when she was younger and she thought maybe there was a bit of stool stuck inside her. She suggested wearing plastic gloves and using a baby wipe gently inserting my finger inside her and wiping the area. It did seem to work.
She still scoots though and I think her urethra is itchy as the area becomes very red as she licks it alot. So I wipe the area twice a day with a baby wipe then put sudacrem on. I also wipe round her anus daily.
The problem may actually be due to yeast but at the moment I manage to keep it under control by wiping her.
Hope that helps. Lovely topic of conversation!
