Of course you can...I agree.
But that doesn't change the fact that what she did holds spiteful intentions...He didn't disown his daughter, he hasn't been abusive to her, he loves her...He doesn't fuck with Eva...So Eva goin and erasing his last name is a statement...She pretending it's so the daughter doesn't feel left out of her new family, but that holds just as much weight as if Kev was to say that now that his daughter got a new last name he can't come around...
...It's all about intention...If Kev was dead, if Kev did actually legally disown her and/or he made no effort to come around, if Kev was abusive toward her, hell if Kev said "Hey I think you should make this change for her own good, I'm cool with it"...Bet!...I wouldn't call Eva foul for any of that.