I like to imagine that in an au where Meleanor lives and Lilia somehow still gets custody of Silver, like Malleus she is also initially disgusted by Silver before growing extremely attached to him because the "you love me, so you'll love my child" thing goes both ways.
A few hcs that I had while I brainrotted about this in Discord dms:
-Meleanor, like her son, is very fascinated by Silver's fast development.
-She is an easily impressed aunt/godmother and would heap SO MUCH praise on Silver for the littlest things. (and immediately turn around and strike Lilia with lightning for interrupting her)
-Lilia, on the phone(?): "Silver just said his first words!"
Meleanor, appearing in a burst of fire: "HOLY SHIT!!!"
-Sort of reflecting fae in folklore, she loves to kidnap take Silver back to the castle with her for "play dates" with Malleus, who will complain about it as he so very gently plays with the fragile infant his mother had trusted him with (he is a tsundere big brother)
-Revan always sighs every time he catches Silver in the castle because he KNOWS his wife didn't tell Lilia she took him, but he isn't unhappy to see him. Will include Silver in Malleus's tutoring sessions even though Malleus's curriculum is much too advanced for the average human, let alone a baby.
-Growing up, Silver calls Meleanor "Mother" because he hears Malleus call her that all the time. When he grows out of it and starts calling her "Lady Meleanor/Meleanor-sama", she sulks about it a bit.