She does not sound ready to get married?
Does her husband know how she is?
Has she had counseling for her anger problems?
How old is she?
Once she is married, it would be kind of not appropriate if her parents always still come to her rescue.... what would her husband think?
If she has such anger/temper problems as you describe... it sounds like she needs some kind of counseling or treatment? And she does not know how to help herself?
Ultimately, she and her husband should be addressing their relationship and scenarios and what they will do if she/they needs help.... she will be in another state and probably not have a network of friends or family, to support her when her Husband is deployed. Her Husband... has to think of that too... if he knows how she is.
If she calls you with a problem.. its not like you can just help her, being so far away... and she will have to cope, like an adult. And, if she is creating these problems herself... she must be responsible for that. Sure, there are normal everyday "problems" that we all deal with as part of life.. but if she is making problems of her own because of lack of responsibility or sound judgment... then that is another story.
She sounds, unable to help herself. Does she have friends? Has she ever held a job? Has she proven to be responsible and self-reliant? How does she treat her fiance? How does he respond to her and her problems? Does he even know how she is? Or is she different with him? Is he able to handle her and her problems and be responsible as a Husband?
So many unanswered questions...
But realistically, you cannot "fix" her problems or her life. If she is an adult, and getting married, then you need to prioritize without interfering in her marriage... or her husband's role, too.
I imagine, if you tell her your concerns and how you feel, she will get angry. She has not learned, that SHE IS responsible for her life... and responsible for fixing it. She is not a child, anymore, and if getting married.
All the best,
Susan