User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-2602:306:CD9A:C860:1896:46C0:1D50:41A4-20181226150049/@comment-87.4.190.158-20181227172228

She decided to face Issei with Gasper support on her own, after having already faced Grayfia, because Crom Cruach was kept away from the battle first by Asia and then by Ddraig, while Strada was kept busy by Xenovia that with Excalibur scabbard is immortal so she could not be retired soon. Strada and Cruach were fundamental to defeat Ise yet they did not fight him and she was the only one with enough power, but she was already tired by the battle against Grayfia.