Glad to still see this topic, because I wanted to respond to it...
Yes, I think PT Angelique does have feelings for Quentin, she's obsessed with him! And IMHO, she's more than a little pissed off that he could marry again so soon after her death to mousy little Maggie Evans. Plus, I think she always saw herself as the grand lady, and believed growing up that being the mistress Collinwood and wife of Quentin was her birthright.
I think she doesn't put a spell on Quentin to love her for the same reason(s) she didn't hex Barnabas. He has to come to her willingly, blah blah blah. That's the only way she can get him to share in her unholy existence.
Did she get busy with Bruno, Will, Cyrus, and Dameon? My money's on yes! As for Trask, you can't be sure. I think she would be too snobby to sleep with the help. And as for Roger - I don't think so at all. He was probably more useful to her if she kept him on a string thinking maybe one day he'd get there.
[spoiler]I've always thought her teasing and sexually frustrating the bitchy, tightly-wound PT Roger is likely the underlying reason why he killed her.[/spoiler]
As to the last question, I guess Angelique was really young when she had Daniel. Of course, this was probably just sloppiness on the writer's part. But suppose that Daniel was only twelve at the time of the events we see in PT1970. He might only have been eleven when his mother died. So maybe she did get married right out of high school. That was more common back in the '60's than it is now, wasn't it?
That said, I have to add that I don't like PT Angelique as much her RT counterpart. She isn't nearly as fascinating as she thinks she is, and is less of a three-dimensional character than RT Angie. I also wish we'd gotten to know more about Alexis before her sister did away with her.