Your fiance sounds pretty independent to me. It sounds as though she wants to still spenda good amount of time with her friends. There isn't anything wrong with that, imo. But, it sounds like you two have different goals in mind.

You're wanting something solid, dependable, and loving.
She's wanting something fun, and still wants a little more space emotionally.

Imo, you two need to have a serious talk about where you are now and where you both want to be. Just come straight out and tell her how YOU feel. Say something like, "I am feeling angry right now and scared that you aren't as commited to this relationship as I am." Then, let her respond. Go from there, making sure to acknowledge whatever she says (by: "So you are feeling like ____?"). This style really does help me get through emotional discussions without them becoming intense or hurtful for either party. And that helps me feel a lot better!

Best wishes sent your way.