I believe this PAM Character not completely negative, in one episode when Niveditha asked about why didnt she settled down, she said situations didnt arise of her settling down since I had to take care of Neil-Ragini kids responsibility so need of her settling didnt arise much, in that part it clearly showed she was never selfish about herself and her own life , she had that sense of responsibility and caring towards her brother and their kids, so she and that situation/part showed some kind off positivity in her.
I believe PAM completely not negative, may be she have problem against Ragini, and end up doing all crap things dont know I may be wrong in this aspect.
I believe PAM may not be completely involved in Ragini-Neil divorce, even if she is that could be some kind off misunderstandings filled in her mind against Ragini.