So what is the character's response? Yeah, we know she has to join in somehow, else there will be no story. But does she JOIN in? Apply for that opening? or does she have to be DRAGGED in? Swept away by that tornado?
And what is her internal response-- dread or excitement?
Well, you know, a lot of it will depend on whether she likes her pre-existing life or not. She will probably dread a change if she likes the status quo, and welcome a change if she hates the status quo.
If you watched Buffy (and everyone should :), you'll remember she had what she considered a great life-- she was 15, pretty, popular, a cheerleader, a good student at a cool LA high school. Then some guy came and told her she'd been Chosen to save the world from vampires, and she didn't like it. It ruined her perfect life. This was something imposed upon her from above, and though she accepts the mission, she never-- and I mean never-- really feels normal again. It's years before she thinks of herself not as "Buffy forced to be the Slayer," but "Buffy the Slayer".
But then there's Harry Potter. Before Hagrid appeared, he did NOT have a perfect life. He was orphaned and being raised by relatives who resented him. He had a cousin who was obnoxious and spoiled. He slept in a closet. No one loved him or thought he was special. Then out of the blue came the message that he WAS special, and he was so special he got to go to this cool school and learn magic. And suddenly he feels like for the first time, he's HIM, he's found himself and his place in the universe. So he's happy with the news that he's got another identity, and enthusiastically plunges into his new life.
A mixed blessing, an opportunity AND crisis, as turning points should be. :)