Sorry if this question has been asked before.
I recently reached out to the advisor I want to do my PhD with. This is a person that I have corresponded with in the past (I wanted to collaborate with her back when I was an undergrad but she was going on sabbatical and was unavailable). She responded quickly, and I ended up meeting with her where she briefly interviewed me about my experience and then she gave me a tour of her lab and introduced me to some of her current students.
Additionally, one of my letters of recommendation was written by a close friend of hers who does research in the same field. Recently I was catching up with this person and they told me that the potential advisor I met with was "excited to have" me join their group. However, when I toured her lab she told me she was glad I was passionate about their research but that she was "not on the admissions committee".
What impact does this potential advisor have on my admissions decision if she's not a member of the committee? Will the committee take her thoughts into account, even if, for instance, the committee itself found me less desirable for the university?