may be a distraction from the present, which is harder to deal with. By worrying about the future, time and energy to be devoted to the present become limited, resulting in a curtailed present, which might fit her ability.
If not worrying about the future, she might have to devote all her being to the present, thus taking full responsibility (or blame) for the outcome.
Since she was younger, when she worried, she felt safer.
Not a professional analysis. Not sure what will help, other than getting her to be more realistic, to be more focused on the present, to have the courage to be responsible for herself, to not blame herself or anyone else.
