I'm really glad that I'm not the only one who didnt get what was going on
Popular girl is used to having girls like her, but not confessing to her? And when a girl throws out her flowers and calls her a peach blossom, its all good? I guess? Cool
Actually, the way you describe it leaves the story making more sense, in that the other girls have all admired her but left it at that. This girl actually put it into words, and felt jealous regarding her paying attention to other girls' gestures and calling her a peach blossom which as mentioned above is symbolic of devotion. So put together, this girl is actually serious where the others were superficial, so she can't just treat it lightly.
That's roughly how I understood it as well. The "beautiful" girl didn't seem like a nice person to me, though, because I furthermore actually took offense that the other was serious. As in "how dare you make me have to face actually sincere feelings". I've actually seen people act that way and they were typically real assholes (like "I should not have to be bothered by the feelings of people I don't personally love and they should feel bad for telling them to me").
Well, I think the offense involved the fact that for the other girls' superficial feelings, all she needed to do was take care of the flowers. The other girl's sincere feelings meant that she had to become an active participant whether she wanted to or not. Now that doesn't mean she wasn't a jerk or anything of course.
I do wonder her stating that she's beautiful was a mistake on the author's part, since it doesn't seem otherwise like she's egotistical. She's friendly to others and doesn't go out of her way for praise, but rather recognizes there's a superficial reason why all those girls give her flowers or say they admire her. It probably should have been done differently since that phrase seems to be interpreted as "self-absorbed bitch" instead.