Family Nicknames for Baby

So in my family my grandma is nana and my great grandma is mammaw and my other is just grandma but my aunt has been like a mom to me so I kinda jokingly say she's a grandma and she's not very old so I joke like she's gonna be like a super young grandma but she doesn't think the baby calling her grandma is a good idea out of respect for my mom which isn't around because she's off doing whatever that I don't want around my baby. Anyways I've always just called my aunt by her name but is there any nicknames she could have that could kind of work as both maybe? I kinda want her to have a cool nickname because most of my family have one of some sort for grand children to call them