I think Morrigan is a bit of a masochist is the thing so you have to kind of prove you can take what she gives or give what she takes or something or other in order for her to like you.
Incidentally she had to be based on "The Morrigan" right? I mean I'd think so
https://en.wikipedia...ki/The_Morrígan
I doubt her social skills are even that refined. To be honest, I think she just has no idea how to deal with people as anything but weak, mindless fools to be despised and looked down on from afar, and manipulated if absolutely necessary. It's certainly clear that she never intended to enter into any commited relationship regardless of potential suiters' strength of character.
What's wrong with Flemeth?
I have a problem with Morrigan, but Flemeth? I can't think of anything.
The whole kidnapping, raising and abusing little girls to steal their bodies when not whoring them out thing makes it rather hard for me to sympathize with her just because a few of the elves regard her as a walking historical monument.
Everything you say you like about her is true for Morrigan as well to my mind, with the added benefit that the latter doesn't speak nonsense or cackle at her own jokes. Or treat children disgustingly like toys and tools. Or for that matter kill people for sport.
The only thing I regret about slaying Flemeth is there not being an option to bring siege weapons.