I know she is super young but she is still the kids' stepmother and the possibility of her having a romantic relationship with someone the age of her kids is very disturbing to me (I know they're not her biological kids but they're her kids nonetheless and she even considers them to be that).
Also, the rude cardinal's remark would be super kind compared to what others would think of her and the rumours that would spread if she ends up with either the prince (highly unlikely) or Nora or someone who knows and is friends with her kids.
Even if it's someone older and all, she is the lady of one of if not the richest house and has responsibilities. No one would leave her alone if she brings a stranger to that household.
So I struggle to see the possibility of romance in this