She has 44 events each with their own requirements - we need to know where you're stuck. Simply click the info tab and tell us the number next to her name. There's also a handy wiki linked at the top of this page with all her events and their exact triggers.
I think they mean when the game tells you to "increase friendship" with one character to continue with another's events, and didn't realize that means progressing further with the required character (which would raise relationship/friendship level)
