BamaMom and BamaDad - First I think it is wonderful that you are so supportive of your daughter through this crazy process that we call recruitment.
Quite honestly, I think you may have hit the nail on the head about the repeated questions. Recruitment is a very exhausting process on both sides; I think some of that may have come through to your daughter. These times are perfect opportunities for your daughter to steer the conversation by asking a question or making a comment about a particular sorority that will open new opportunites for conversation. For example, she might ask a member what her favorite activities or memories about her sorority are or ask a direct question about a sorority's philanthropy. This will show the member that she is interested in her sorority as well smooth over the rough conversation spots.
Preference rounds, which I assume are quickly approaching, are wonderful. Your daughter will have the opportunity to see firsthand the sisterhood that each sorority shares. For me, it was the moment that answered the question where I would find my Greek home. Just tell her to listen (and speak) with her heart.
Thanks for sharing your daughter's updates with us.