Hi frustrated101 and

I'm sorry to hear you're having problems with your daughter-in-law. Has she been diagnosed with BPD? What does your son have to say about the situation? Is he concerned about how his wife's behaviors are affecting their son?
BPD is a very confusing emotional disorder, a mental illness, that effects everyone who gets close to them.
Here's a link that might help you to understand the disorder a little more:
Video-What is Borderline Personality Disorder?And one to help reduce conflict, like the text messages you mentioned:
Video-Tools to Reduce Conflict with a person suffering from BPD There are a lot of members experiencing the same as you are right now; you're not alone. We're all learning new ways to communicate (plus a whole lot more!) and accept that this is truly a mental illness. There's a lot that we can do to improve our own lives!
I hope you stick around and continue to post, it really helps getting some of our thoughts and feelings out there; we understand where you're coming from.
Thanks for joining,
Phoebe