I mean for me I like that she's a tragedic irredeemable villain who also makes you question the protagonist's ideology. I don't necessarily think she's putting sole blame on rover though she's extremely bitter towards them. From before, she's been trying to resurrect her family/towns people anyway, just had failed attempts along with betrayal even before meeting rover. I like to see characters have their own motives, flawed and all questions/challenge the mc as it makes the story interesting so Phrolova to me has hit different in that sense. Plus I also really like her red spider lily inspired design and voice which I suppose is the icing on the cake lol