She's not really very smart, isn't she? She should've written all the important dates and made sure to keep track of them. Although tbf it has been years.
Also if you count the time, she left for more than 30 years: shouldn’t she take that in consideration ? Isn’t it enough time to grief and let go of the past ?
If she still wasn’t able to go back to her original world even after following the original storyline why’s she doing it again