Has this ever happened to you?!?!

[Cadillac]

I'd probably just start locking my door. I agree that this means she feels comfortable (regardless or how rude it was) She might have even saw your face or heard you sputter and probably figured out this was not ok.

If she did it again I'd say something (nicely though)

Stuff about tolerating disrespect and not having an open door policy, and so on . . ., . . . well . . . . I think we need to treat these types of relationships less 'business like' since they trust us with their children. That sort of alters our type relationship a little.

[Sunflower]

What she just walked it ??
What if you or your husband had been naked.. just got out of the shower... whatever..
That's just rude !

If you are uncomfortable confronting her you can just lock your door.. or even have a sign on the door that says to knock before coming in.

Some people!
I don't have that issue with the parents . but the grandparents.
When ever they come to pick upi the kids they always try the door without knocking and each time I tell them they must knock as it will NEVER be unlocked for security purposes.