Vivienne's travels through her alternate realities and discovers different lives, loves and losses. Now she risks losing everything in order to have it all.

I’m getting a “Time Traveller’s wife” vibe, but I need to know more about the story. Phrases like “discovers different lives, loves and losses” and “she risks losing everything in order to have it all” are too vague.

What is Vivienne’s occupation, strength and flaw? What is Vivienne’s main goal, and what’s stopping her from getting it? What happens if she doesn’t get it?

Check out the “How to Write it?” section of https://loglines.org/howto/ if you haven’t already done so.