But it couldn't.
You see Anoraks said that he had been altering time for 200 years from his static limbo out of time space time platform weapon... (badly written, poorly thought out, just ride with it...) so what we thought was the beginning of the story in the first minutes of the program was probably the million millionth time distortion of the original history after which kes might have forewarned the crew that the krenim were complete bastards....
In every timeline that played out that Kes's warning "happened" and wasn't misplaced or tucked under as a non event because of altered history, Kathryn knew well enough to play nice or go around anyone called the Krenim. It was only in a timeline where "before and after" never happened or never happened as we saw it that Kathryn didn't know well enough to go around or play nice with the Krenim that year of hell (as we saw it the second time.) could have resulted in Kathy getting frakked to the point that they all died or she invented temporal shields.
If they went around or played nice, she never met Annorax and he'd have rubber banded time to a point of his choosing where Voyager hadn't yet got past his influence.
If they died, even if they met Annorax and died he'd have rubber banded time to a point of his choosing where Voyager hadn't yet got past his influence.
If they got though without getting frakked and continued on their way to the AQ, Annorax'd have rubber banded time to a point of his choosing where Voyager hadn't yet got past his influence.
Only natural selection in a difficult environment would create a strong Janeway. the more difficult the environment, the stronger the Janeway.
It's quite obvious when you think about it, that is, before you start including the changed timeline from ST First Contact.