Hi k1313.
My husband thinks that this was a calculated manipulation on her part. I'm not sure... .any thoughts?
With BPD there is such emotional dysregulation that no matter how it seems to us, IMO their actions rarely have well thought out and deliberate motives. So with this incident, she probably did mean it 100% when she said "I will honor your request." at the time she said it. Then, as time when on, her fear (possibly of abandonment), triggered by knowing she did something you asked her to stop doing because it bothered you, kicked in and her emotions drove her to try to test and push your limits not to bother you but due to her own emotional drive (aka her fear).
When thinking about and discussing the behaviors of a pwBPD, I think we often forget that at the root of all their dysregulation is raw emotion. When talking about behaviors that are well thought out and with deliberate intent to manipulate and cause harm, IMO we are then talking about another disorder or traits like NPD or ASPD.
Having said all that, I do not think you should change your request or allow her to keep pushing the limits you set with her. Intentional or not, emotionally driven or purposely manipulative and sinister, her behavior is at best wildly inappropriate. I think you are right to question her behavior. Be ready to remind/set limits again, but in the meantime, treasure the pictures she is sending to you.
Regarding your family phone plan, I would get my own.