I think she reacted to Yashiro because of his connection to Ren.
She was indifferent when she first looked up and saw him.
If she liked Yashiro, then she would have recognized him immediately.
She only paid attention (looked up again) after her manager pointed out that he was Ren's manager.
Yashiro has only had one client, Ren.
So, if Yashiro has taken on another person then that person must be especially talented.
Which means that that person, Kyouko, is serious competition that she (I cannot remember her name) needs to pay attention to and eliminate.
She (I still cannot remember her name) started blushing with Yashiro because she is fake and she wanted to appear humble and kind. It was apart of her strategy (of continuing to have a good public perception).
It's just like Yashiro, he recognized her immediately, but then pretend not to when she approached him.
This is why Kyouko was confused! She's still honest and naïve to "showbiz behavior"!
She will not be boasting about her crush if it's yashiro lol. She is the type who loves to be the envy of others.
You guys, I think her real crush is Yashiro. Back in ch 242 as soon as she hears Yashiro's name, she reacts. When Yashiro compliments her, she blushes. I bet when she was working on that movie with Ren, she saw Yashiro a lot and developed a crush on him. That's why she and him are looking at each other on the last page of this chapter.
http://www.mangago.zone/read-manga/skip_beat/mh/465387579a9f3a90/Ch242/pg-17/
http://www.mangago.zone/read-manga/skip_beat/mh/465387579a9f3a90/Ch242/pg-20/