How does an outgoing girl with feelings behave around a guy she likes?

Everyone at some point has met a very outgoing, bubbly, confident and maybe a little flirty girl. It’s just their personality to hug people, put their head on people's shoulders etc. They might go overboard with this stuff when they do it around a guy they want to attract.

But how do they behave around a guy they have feelings for and they know it will never go anywhere beyond very good friendship?

Will she behave in the same way as any other good friend?
Will she ignore him as much as possible as interaction with him will just hurt her feelings even more?
Will she be sweet and lovely if the guy comes over to talk to her?
Will she get nervous when he is around and starts figeting, playing with her hair, biting lips etc?