We actually had an Angela Odinsdottir from the comics for a while and Frigga had a "....?" Moment and then just ran with it. And universe be dammed, Torunn is her granddaughter regardless. So Sylvie will be a "..............okay" and then that's her kid, fight her. She's the goddess of the home for a reason, mmmk. She's also one of the guardians on the kids' floor, she's got this mom thing down and you can be prickly with her all day long, she's going to love you anyway.
Bruce is 200% okay with her not being Loki, one is plenty! (Don't tell him about variants, his poor genius brain might explode 😂) But he will definitely understand her identity issues going on here for obvious reasons.