Welcome to the parent's forum, Iloveher, I am so glad you have joined us. I am sorry that your daughter as relapsed with her BPD symptoms, I understand how difficult it must be for you particularly with a wee granddaughter involved and another child on the way. Your daughter obviously wants to do what is best for her developing baby, it seems she got her life in order for the first one, and is maybe trying to do the same by recently quitting her meds with this pregnancy. I am glad to hear that she went to see her doctor, who would be best to know if the benefits outweigh the risks when it comes to prescribed medication.
The good news is that you know that your daughter is capable of taking care of herself and managing her own life as she did with her first pregnancy and baby. So at least you know that there is hope of her returning to being more responsible and she too, will know that she is capable of this since she has already lived it. All these things are good, and hopeful.
Since until recently you had a prolonged period of relative calm, as you say, it is a good idea to refresh yourself on the skills. Along with reading Stop Walking on Eggshells, the links on the right hand side of this page are an excellent place to start doing that
I hope that you will continue to post, Iloveher. We all learn so much from each other here and the support we give and receive really can give us strength and hope. None of us need to do this alone. MomMae