User blog comment:B214/Question and Answers/@comment-222.222.251.207-20131129064007/@comment-174.119.241.202-20131203235136

actually Rias and her peerage have never interacted with Seekvaira and her Peerage, so there is no way to know how she feels about them for sure.

Although, at the end of volume 9 it was clear that she did not aprove of how strong Issei was becoming, or how he seemed to be favored by Ajuka Beelzebub, or how he would eventually marry Rias and become the brother-in-law of the current Lucifer. So she might have some negative feelings about Issei.