I met someone online, and we connected. Now she’s ghosting me. Hey Elderly Aunt, what should I do?

Dear Elderly Aunt: A few weeks ago I met someone online, and we immediately hit it off. We texted with each other regularly and had a fun banter going back and forth. Just when I thought this weekend might be the weekend for us to meet up, she disappeared! I haven’t heard from her in days, despite reaching out to her several times. Everything was going so well until then! How do I know whether to keep making contact or to call it quits? What if we might have lived happily ever after? What if we were exactly who we needed?! What if I never get the RBG cross-stitch that she promised to make me?!! Help!!