Do you think Danielle doesn't want to be rescued anymore? After all she hasn't stopped sending the distress signal, yet she doesn't want to join the survivors of the crash.
I just find it odd she wanted Sayid to stay with her. (The having someone to talk, touch speech) She had an opportunity to be with others, maybe even protect them. Why did she decide to stay by herself again?
She didnt want to join Sayid and the rest of the survivors out of fear that they would get "infected" like the rest of her crew and have to resort to murder again.
I'm not sure that it isn't just a simple case of after having been alone for so long Danielle just isn't comfortable with the thought of being in a large group of people. One or two would probably be fine, but the thought of a group of 40 or so would likely be overwhelming to her.
There's a comfort level in staying in that little dugout where everything is familiar and she has all of her belongings around her. If she joined our plane crash survivors she'd have to trek all that stuff halfway across the island.