My Mom has always had what would be clinically described as "emotional lability". Her emotions are intense, and her behaviors and mannerisms can get erratic. Most recently she has started using different voices (almost as if she's acting) when she is upset. She has phrases that don't necessarily make sense, however are used in these really strange voices when she is angry about something. Most recently it has been "take back the steal" (she's a liberal and when my brother started dating someone who's family supported trump, she'd go on rants that were almost theatrical. I can't describe it). These personalities come out seemingly out of nowhere. 

She also assumes the personality of whoever she's around, down to their mannerisms. She's expressed feeling like she has "low mood" and emptiness. She will copy those around her down to mannerisms, language, tone of voice, and volume. Initially I thought it was the byproduct of having a really poor sense of self, but now I'm wondering if it's something more. Her personalities range from exhuberantly yelling and calling people "girlllll" to talking in a low tone and using words that aren't commonly used in conversational settings.

She had a lot of trouble creating and maintaining friendships when I was growing up. She has solid relationships now, but she morphs into each of her friends whenever she is around them. It's still really hard for her to make genuine connections. She also seems to seek out a lot of drama (intentionally provoking people and then acting like a victim when they inevitably tell her to stop). 

The inverse of this is a mother and grandmother who loves her children and grandchildren fiercely. I really appreciate a lot of things she has done for me and love her. Her mental health and anger/ erratic nature qhas been such a challenge though. I am wondering if it's BPD? 

I'd love to hear everyone's insight.