There is a step by step guide for the events of all main characters in the walkthrough that is included in the game files. You can check which steps you've done there, which is the next you need to do to advance her events, and what requirements you need.
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It's not in the game itself. It's a .pdf file that is in the folder of the game files after you unpacked it from the .zip. The only exception is the android version.
And yes, an alternative way to get the walkthrough is to select the download choice at the bottom of all download options here on the game's page on itch.