I don't agree with that author. It's one opinion.
Adolescents have the task of forming their own identity. They know they are "not their parents"- they are their own person, but they don't know who they are exactly- so they may go through different ideas- clothing, music, hairstyles- that are "not their parent". For a teen girl- this could involve a form of "rejecting" the mother in some way. I think it takes an emotionally secure mother to get through this stage- and a mother who has the emotional maturity to not react in a hurtful way. Teen need boundaries but the boundaries change as they mature.
Emotional maturity, a sense of self, and boundaries are areas of difficulty with BPD.
This idea of teen age mother daughter issues is especially concerning to me because BPD mother "explained" our relationship that way at the time, and also implies it's a stage and it was due to my being a teen ager- taking any accountability away from her. My being a teen was the reason and it was assumed I'd get over it.
Sometimes it is the teen who has the issues- a teen may have a disorder, or troublesome behaviors. Or it may be situational- the teen is doing fine at school and elsewhere- but not at home- then one has to look at what is going on at home. It's not usual for a "troublesome teen" to be making straight A's at school like your D is. I did well in school too. Behaviors like promiscuity or drugs, or rule breaking- these didn't happen either. Yet somehow according to my mother, we had a "mother-daughter" teen age problem.
I experienced this from the parent perspective too. Yes, there were times my own teen D had me in tears- the moodiness, the rejecting of my ideas- like if I bought her something to wear, she didn't like it, or if I said something she'd roll her eyes. But who is the adult in this relationship- me- and this behavior isn't about me but my own child trying to decide who she was. The basics were in place- good grades, friends at school, no delinquent behavior. Boundaries were still there but I had to adjust them to this new stage. This is that "normal teen conflict" my mother was referring to, but it was qualitatively different from the situation with my own BPD mother.
The other side of this is that I got to experience what being a "normal" teen is from observing her- something I didn't experience. My teen could "push back" at me in this process because she wasn't afraid of me. I may have felt hurt feelings but I didn't respond with verbal or emotional abuse. My teen wasn't parentified- she wasn't responsible for my feelings. She didn't come home from school wondering what kind of mood I would be in.
If my relationship with my mother was due to "mother -daughter" teen conflict- then I should have "outgrown it". In that case, the issues would be resolved. I feel I tried. I assumed the blame for the relationship and have tried to establish a better one as an adult but she still has BPD. She is still emotionally and verbally abusive as she was when I was a teen.
Explaining what went on at home when I was a teen as a "teen age mother-daugher conflict" was invalidating and put the reason on me. It also hid the chaos and emotionally abusive behaviors that were going on at the time.