She knows Mori is forcing her way to be friends with her again, but she doesn't wanna deny her either. Both said one time that they were incompatible and that's why they are great friends, but the same thing made both take different ways for a long time.
Kiara understands friendship as "how much the other person can do for me and how important I am for the other person", and in consideration on how much the other person can sacrifice for her, she will give her love. That's why her friendship with Ame and Reine works, because Ame is an ultra saviorfag that can't say "no" to a request and Reine is a great person in general. Japanese people would look at her as a nuisance and high maintenance of a friend, so they aren't gonna get along with her more as "my friendly coworker". If you aren't there 24/7 for her, she will think that you hate her, the exactly thing that Mori did to her in the past when she was "her best friend in holo", and the only one for her traumadumping was Ame, because Ina kek and Gura kek.
Out of the rrats, they don't hate each other, but it's clear that they aren't as friends as before, and they will never be like that again no matter how many times Mori humiliates herself in public, because she can't be "that type of friend" to Kiara