Torn in two . . .

Patty Gilbert is elated when she finds out that her boyfriend, Jim Hollis, is coming home from college for a weekend visit. But then she finds out that her older sister, Jana, is coming to visit the same weekend, and she tells Jim she'll have to spend most of her time with her family. He blows up at her, and before Patty knows what's happening, they have a huge fight and break up.
Patty feels aweful, but at least she knows she'll be able to confide in her sister. As soon as Jana walks in the door, however, she announces that she' getting married in two weeks! Jana's so excited about the wedding plans that she has no time for Patty's problems. Patty feels she's lost her boyfriend because of Jana. When Patty accuses her sister of being selfish, they have a fight. Now it looks as if Patty has lost both her sister and her boyfriend!

By the time the lovers were reunited in a classic Hollywood happy ending, Patty had made up her mind. She would make things up with Jim, no matter what it took. She loved him too much to let him go without a fight.
The lights came up in the movie theater, and Patty sniffled discreetly and felt in her purse for a tissue. "I'm a total cornball when it comes to romantic movies," she said, wiping away her tears.
Then she froze, not quite sure wether to believe her tear-misted eyes. Was she seeing things? Had the movie gotten to her that badly?
At the front of the movie theater, turning to head up the aisle in her direction, was Jim. And he wasn't alone. At his side was a beautiful black girl in a short purple dress, a wide purple headband in her dark curly hair. The girl was laughing. Then she said something to Jim, her face very close to his.
Patty couldn't believe it! The whole time she had been crying over him and wanting to get back together, he had been in the same movie theater, cuddling up with another girl!

What kind of scheme does Jessica have planned to meet the boy of her dreams? Who's Who?