Here's a thread about her lore.
From the short it seems that she (for unknown reason) knew about and used shadow magic to go through time and space... and combat the side effects. This most likely caused her to become a target for shadow creatures/Them.
While trying to outrun them one day she broke one of her watches. Hastily she fixed it and (probably) accidentaly opened a portal to the Constant.
Either that or the shadow creatures were too close and influenced the watch.
Now as a survivor she has to deal with her 'unstable' bond to this realm and the shadow creature that is forever woven into her timeline
At least that's my take on the short.
Comment what you think/ what I might have missed/ stuff she reveals in-game
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