.. How do I save Jamie?

The first thing to do is get her to dance with Joey.

How do I get Jamie to talk to Joey?

While you dance, make small talk. When you ask about her preferences, she'll turn the question around and ask you about your preferences. But if you give her Joey's actual preferences, it'll just turn her off; he is a good 70 years older than her, after all.

To get her confidence, you need to anticipate the answers she would have given -- i.e., tell her you like what you know she likes.

Ask about Jamie, then give the right answers in these three areas:

Her Studies

Her Spare Time

Her Hometown

Once you give the right answers for all three areas, things will proceed automatically.

What do I do after Jamie is gone?