I need help

So I’m kind of in a tough spot rn.

There’s this girl I’ve known for two years (we’ll call her Stephanie). I met her through a friend (who was a junior in high school, we’ll call her Sarah). I was a senior in high school and Stephanie was a sophomore. (Stephanie is currently going into her first year of college and I’m going into my third year of college). We hit it off pretty well and we would always say hello to each other in the hallways.

I once had my mom make her cupcakes for her 16th birthday and brought them into school for her. She really enjoyed them, shared them with her other friends and she thanked me later over Instagram. Few months down the line, I asked her to be my date for senior prom. She told me she was flattered but it probably wouldn’t go over well with her parents because I was a senior and she was a sophomore. I was disappointed but it was a valid reason so I thanked her for being nice about it and we still continued to be friends.

One of the things that makes her unique is that she loves water fountains and loves being a mermaid (she has a mermaid tail and everything) So every time I see a water fountain or anything mermaid-related while I’m out and about, I would snap a pic or a video and DM it to her. She liked that I was thinking of her and has never said anything against it.

Fast forward a year, I go to my Sarah’s senior internship fair and saw Stephanie again. We all talked for a bit and me and Stephanie hugged each other goodbye (she wasn’t comfortable with hugs until this point).

During college, Sarah would send Snapchats to me with her hanging out with Stephanie and I would always reply “MERMAID!!” and Sarah and I would have a laugh about it every time. I would tell Sarah to say hello to Stephanie for me and she always did.

But after awhile, Stephanie stopped responding to my messages or anything I sent her, and doesn’t even open them. I begin to worry but I wouldn’t dare bring it up because I was worried that she might get angry at me for asking or flat-out block me (I was in an abusive friendship for four years and I’m still scarred by it)

Fast forward another year and I go to my younger brother’s senior internship fair. My young brother is the same age as Stephanie and it was grouped alphabetically. Me and Stephanie’s last names both started with the same letter so I found Stephanie there too. She was really happy to see me, we both gave each other big hugs and she showed me her presentation. I asked her how things were going and we caught up. We both gave each other big hugs goodbye and I was on my way.

So of course, my younger brother’s graduation comes along and Stephanie is there. My mom wanted me to bring my good camera (I’m a photographer during my free time) to take photos of my younger brother. She suggested I also take pictures of Stephanie too. So I did and the pictures came out beautifully. I went to find her and I did. After we hugged, I met her parents and sister and told her how awesome it was that she jumped into a water fountain in her prom dress during her senior prom and we both laughed about it. Told her I took some pics of her on stage during graduation and she told me to DM them to her. I did, and she loved the photos and responded with “Aw love these photos! Great seeing you!” and I replied the same thing.

Fast forward to now, she doesn’t even open any of my other messages despite us getting along so well with each other. I don’t send her messages very often either. I don’t know if she is the type who is really bad at getting back to others or she’s just flat-out ignoring me. And for the record, I only like her as a friend. I’m afraid to ask if there’s something wrong because I’m worried about digging my own grave.

Help?