I've seen a way for you to get Aisha, but it will require a price from both me and you.
Lexus has Aisha and she needs Chungha #4 for set completion. I can trade my Chungha #4 to you for your IOI Mina (so sorry, but I'm almost done with the IOI set and still need Mina), then you can trade Chungha #4 with Lexus for Aisha.