Alumnae Volunteer Involvement with Chapter

[Kansas City]

(Please forgive me if a similar topic has been posted elsewhere ... I sure as heck couldn't find it)

I am a few months into advising a chapter that has had no adviser support for several years. Luckily, they are very self-sufficient and strong organization on campus. I will be putting together an advisory council this fall and have found some interest from a half dozen local alums. I have requested that interested volunteers be initiated members of the organization, be 5+ years out of undergrad, and able to travel to campus a few times each year, etc.

Here is the question ... I've got one alum that is VERY interested in helping but she just graduated 3-4 years ago and has a biological sister (sophomore) in the chapter. I really want to get this volunteer involved but want to protect the council and sorority from any unnecessary drama this might create. For example, I don't want the volunteer falling into her sister's clique and create friction among the members and board. Does anyone have an idea of how I might best utilize the talents of this enthusiastic volunteer?