I guess it would be a very DPC thing to do, misdirect everyone into thinking Lynette is connected to the Royces... but then it's actually Bella who knew her. And godmother or not, it would feel like a knockoff incest route, considering her age and relationship to Lynette. The quote unquote next best thing.
Ehhhh. Bella already has this whole thing going on with James, some dark secret, being MC's teacher, I don't think we need to add this as well. I actually don't really want to call her "mommy" either, it feels like it trivializes their relationship. Makes it more carnal than romantic. Bella vs Jade, basically.