you set the boundary and she still "respected" it, yet you were at the very least miffed... so she knows she still has a button she can push...
She did and she didn't respect the boundary. I had asked her back in April to stop bringing any OM, period, to the house. We disagreed at that time about what was appropriate, and I ended the convo by indicating what my feeling were about it. So - she respected the original boundary, but she didn't respect how I felt about it.
You're right - she does have that button to push.
Note - I probably acted more hurried than anything. I had tried the calling her out on it back in April and clearly stating my feelings, and that didn't work. What next, coach?
Lesson learned here. ALWAYS set your boundaries further out than you think they need to be!