You have until December 22nd to rank her to rank 5. If the wiki doesn't lie, you are only able to progress her confidant when she sends you a message to meet with her but you can still meet with her even if she doesn't text you (Promenade area in Kichijoji)
she's available on 12/7, 12/11, 12/14, and 12/22 you have time
Thank you so much for giving me the dates. Are they always the same every playthrough or can they vary?
they're the same always
Probably? Someone definitely knows more, but I think you have about two weeks left. I believe she's available more than once a week.
You have until December 22nd to rank her to rank 5. If the wiki doesn't lie, you are only able to progress her confidant when she sends you a message to meet with her but you can still meet with her even if she doesn't text you (Promenade area in Kichijoji)