Every form of lack to express emotions, can be dangerous. If the person is out of touch with her or himself, its difficult to express your own needs. That's been passed on, generation on generation till someone say "no more". That person is able to heal the ancestral trauma and the future generation.
I can understand why she won't face her mother about it, it can be very painful. Especially if her mom is still 'stuck´. But there are other ways to heal from this, if she can look inside and heal herself. She can heal others, by just showing and transforming herself. She can even have a compassionate conversion with her mother :-)