OK, so there's this social group I'm in. I saw this girl, let's call her Megan, two times. Didn't get the chance to even talk. She had this bitch shield when she entered, just kept talking to the girls not even acknowledging the guys.
So I lost the chance to talk to her, since she left the group because of some arguments.
The only connection I have is her number (because the group operated on whats app which requires phone numbers not because I asked directly).
What can I do?

You could text or call her

This. And she isn't an 11. She's just a female who's a little attractive. Women are either ugly, in the middle or attractive. That's it.

And some women are very attractive or extremely attractive

Mouths literally drop when she enters.

What to say? She's been asked out by everybody in the group and rejected all of them.

You could start with a greeting... then, if you get 'rejected', you could go out and meet more girls.

I'm good not a master PUA, but good

In that case what makes you different from your group, since she's already rejected everyone in your group?

Woooooord