So she forgave the Eliksne and is will to work with them, but she is not willing to forgive Crow for an incident that his past life did 5 years ago, plus she has had a full year to get over the revelation that Crow is Uldren. I mean the Eliksne killed her mom, were the major cause of childhood strife for her, and her main enemy that she fought against pre red war. So basically, she forgave the Eliksne in a couple weeks despite 20-30 years of trauma caused by them, but can't get over Crow being Uldren and him killing her friend 5 years ago. Not to mention she has probably lost more friends (both guardian and human) to Eliksne than she did Uldren. Also House light regularly accepts refugees from other houses, so it's entirely possible that members from house winter or even her mother's killer is living amongst them. Unless this is a plot point and Mithrax points this out to her in order to get her to forgive Crow, this is poorly written.