I think the issues are concerned with love, and the loss of a loved one, not so much her father. She's taking the common reaction of self-insulation, and though she's gotten close to Marten (and had a hard time coping with that for quite a whie pre-Dr. Corinne), she absolutely freaked out over Sven, and that was more of a fuckbuddy situation (until Sven grew up a bit, and then she had to keep him at a distance).
But now, she doesn't have a good friend or a fuckbuddy (I really hate that word, and the idea behind it).
She's in love, and more importantly, she has a new loved one. I think that in her mind, loss is now just around the corner.
And if she's not careful, that expectation will be self-fulfilling, no matter how patient Angus is.