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I would challenge her lack of fear, if her ability can't trigger automatically as stated in comments she should still have some fear of death, things can happen around her that she isn't aware of a...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47714 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would challenge her lack of fear, if her ability can't trigger automatically as stated in comments she should still have some fear of death, things can happen around her that she isn't aware of and there are many things that can happen before she can react to save herself. We see in Edge of Tomorrow that Tom Cruise's character becomes extremely cavalier about danger because as soon as he dies he wakes up at the start of the day again and there is nothing he needs to do to trigger this. This is not the case for your character, your character is required to consciously reset time and she must still worry about whether she will be able to react. In the situation you described having a gunman hold up a clerk, she may worry there is a second gunman, she may worry she'll blink or look away and the gunman shoots her then. She may be able to reset time but she still lived through whatever event she reset to avoid. This could lead to her having post traumatic stress from all sorts of events that never happened (have fun explaining that to a therapist). Lastly, as an author you may know the exact extent of her power but does she? Without having died she would have no way to know if she could reset after that.