User blog comment:B214/General Discussion/@comment-73.46.6.122-20170327215722/@comment-26821288-20170328050024

She clearly said she done this to gain the favor of Azazel and Shemhazai and co., and she thought to do that by making herself stronger, with having Asia's Twilight Healing, which she thought would be useful in battle, since she can heal herself, although proven wrong. And don't forget, they didn't have just SGs, they had Longinuses, so if she was jealous of them, she would have probably tried to take Issei's BG, unless she really thought he didn't have a Longinus, in the end.