I know it's supposed to be cure and trope based, but I can't stand Ayano. She would not make for a good friend in the slightest.
Think about it, by all appearances, Yuki is a shy introvert with some serious social issues. Yes, she wants to make some friends, but she also doesn't want to be the center of attention and she really does need help working on her issues.
What does Ayano do? Shove her into a front line job at a restaurant, with no warning, when she very easily could have given her a much less prominent role.. Yeah, it was played for laughs, but even then it ended in near disaster.
Similarly, there's the whole glasses thing. Again, it's a trope, "You're really beautiful behind those glasses" and it was the boy who tried to take them, but still.
Most of what Ayano to do seems to be like that. There's definitely a level of concern for Yuki, but it's very haphazard and mostly a mater of considering what Ayano wants (a cute friend and making said friend cuter, in her opinion) or things that would appeal to Ayano (working the front of the cafee, with no real instruction given).