When is the right time to tell a girl that I like her?

I have been talking to this girl more frequently than I ever have for the past month or so. I’ve known her since about September of 2024 and have sorta liked her ever since but when I found out she had a boyfriend I accepted that I wouldn’t be with her and stepped away a little. Around the end of January or start of February her boyfriend broke up with her and she doesn’t really know why. She asked me for help with it and I said yes and this guy really is done with her and she was looking really desperate. Supposedly he still loved her but said he didn’t want it to be like he was leading her on. Ever since then we have been chatting more than ever and we even canceled our plans with our friend group and went somewhere just us two. She is just like really nice and I love her for that. Not even her looks even thought I would say she’s pretty. She says she is crying every day and I am trying my best to comfort her and help her and be nice. I’m trying hard to get closer to her and have her notice what I feel. She said she wanted pineapple one day and I said that I have one and then she asked me for it and I said maybe. I then cut it up that night and packaged some for both of us and gave her a container at school. She thought I liked some other girl for a little because on my instagram notes I had “Something” by The Beatles and she asked me who it was for and I said some other girl who complimented me once and we had laughed in gym at something together before and I thought was cute. Truth was I still liked her and I didn’t even put the song on for a girl. After that I started putting songs on for her and I guess she still thought it was for other girl up until this Monday. She did reply to a couple more saying “NAME 🥹” or things along the lines of that and I just said no to the ones after the first time. Me and this girl have fallen asleep on call several times together and I had never done that once until then. We were literally on an 18 hour call once. She says she is crying every day about her ex and posts songs relating to it on her insta notes. This girl is just so damn confusing! She FaceTimed and started playing geometry dash with her feet and I joined in and she posted it on her story. We both posted on our stories when we went out and many of my friends said they thought it was a soft launch it looked like one. I have one class with this girl in school and I am frequently glancing over at her because I just like her so much. I’ve never met a girl that treated me like her and I love it. I don’t want to lose her as a friend it she doesn’t like me back. I don’t want to wait too long to tell her and I can’t find when or how. I was gonna write a letter but then my friends told me that’s too much and I agree. I really need help finding the right moment and the right words. Thank you in advance and sorry for writing so much.