Might also be some sort of fucked up "knight in shining armour" thing she's trying to do if she did recruit someone, which would also explain why Delilah blurted out that she knew that Ashe was a duplo - in a sort of display of 'hey, you can trust me, I can help you'. Given how Delilah seems to romanticize things and naivety, it certainly isn't impossible.
I'm simply looking at it from Ashe's point of view and how she's been portrayed, her mom can be trusted but Ashe doesn't come off as someone who's able to trust her mom enough to talk about the things she needs to talk about. Likewise, Rachel would also be very difficult to trust with anything more than superficial things given their history, even if the relationship is "mended", it takes years to rebuild trust enough for someone as anxiety-filled as Ashe to let someone close to her again.
That basically leaves Fiona, and even though Ashe and her doesn't seem to have had many deep conversations, the fact that she decided to confide in Fiona that she was a duplo, Fiona seems to be the only current character that Ashe would be able to trust unconditionally.