Yeah I've never read Hime Kinu as hating champ, they pretty clearly love and cherish them. Rather, Kinu's grown more into her role in Kitsune society and thus away from you since you're still an "outsider" no matter what. By default that means you're a bit more distant than before and there's a bit of angst over that and the lost years. If anything it's because she loves you so much that there's grief but she's moving past that and so should champ. I believe there's a line to that affect somewhere in her dialogue, that the fact she doesn't need you any more makes the fact that she chooses to spend time with you more meaningful.
Also Inari Kinu means having Kinu and Kiyoko at each other's throats and that just doesn't seem like a good state of affairs, it feels especially bad since Kiyoko's the one who had to raise her for 10~ years. Not to mention Kinu's fundamentally a part of Kitsune society more than ours and as a Kitsune she can't really integrate into the Frostwood since Kitsune are still seen as "soul suckers," having her rebel against that seems like needless friction. I also don't really dislike Nakano? At least as a partner for Kinu. Don't get me wrong I think he's an arrogant brat but like, he's young, being arrogant and ambitious is almost expected. I think it's best summed up as "she can fix him." In particular, I think the threats to her safety would get him to mature a bit, and the fact that he's in love with a "barbarian's" child should help him get over that.