My SO has an uBPDxw and two daughters. D14 and D18 and in my opinion they both have picked up some

fleas (behaviors of their mother).
D14 plays the "I'm sick" game to stay home from school (avoid things) or get attention... .mom play's the "I'm sick" game to appear the victim (to avoid things) or get attention. (Waifish behavior)
D18 likes to manipulate (out smart) people to get what she wants and can be passive/aggressive or sometimes just plain mean... .mom likes to manipulate (out smart) people to get what she wants and can also be passive aggressive or just plain mean. (What is really sick is when mom and D18 do this to each other... .symbiotic manipulation) (Queenish behavior)
Both daughters recognize these behaviors in their mother but don't see the behaviors in themselves. How do you make them aware there is an issue? How do you help them unlearn these behaviors?
The other thing going on with them is that all of their close friends are coming from dysfunctional households (alcoholism, drug use, one friend abandoned by her dad). I understand that the girls are more comfortable with others having issues because they can relate and I'm happy they have friends they can talk to and be honest with, but I worry that they don't see many examples of more healthy families and peers. Part of the problem there is that because of their own slightly off behaviors and their mother's interference they don't connect with their "healthier" peers and those peers don't connect with them.
D14 is seeing a Therapist and D18 did up until she went away to college this year. Dad and I set a good example but this has only been for the last few years.
Any suggestions on how to broach the subject of these concerning behaviors? Or do we just let them figure it out on their own? Maybe with the younger daughter try to work on things through her therapist? How can we assist both girls fit in a little better and still be themselves? Or am I concerned about nothing?
Is anyone dealing with something similar?
Thanks in advance for your feedback.
Panda39