Isabelle is a very cruel, demanding, imperious Domme who likes to sabotage her subs. In many ways she emulates Alec and enjoys taunting her subs as she torments them. While she loves doing aftercare, in the moment she can be very harsh and gets caught up in things, so anything not explicitly expressed as a boundary is fair game. Even if she's presenting femininely, she likes to be called Daddy. The soft, cuddly, motherly type of domming doesn't appeal to her at all as a Dominant. It's also worth noting that unless she has a source of domination over her coming from somewhere, she'll be dissatisfied sexually and personally, and she'll take that out on the sub.