38F postponed our 4th of July plans, is this a soft rejection?

I (23M) met a woman (38F) at a networking event a few weeks ago. I found her attractive, we talked, I asked for her number, and after a week of texting, I invited her out for coffee, saying I’d really like to get to know her better.

She responded positively but was about to leave for a 3-week trip. She said we could meet the next day for a quick coffee if I was free (I wasn’t in town). While she was traveling, we talked every few days and she’d reply with how her trip was going.

She just got back yesterday, and we talked about 4th of July plans. I told her to let me know if she’s looking for something to do and that it’d be fun to celebrate with her. She responded: “Yes that sounds fun! Let me figure out what’s happening tomorrow when I’m back and I can let you know when I’m free 😊”

This morning, she texted saying she’s free tomorrow evening or on the weekend and asked about my plans. I said I’m free all weekend and that my only plans are seeing her tomorrow night. I gave her two options: fireworks or quiet dinner downtown.

A few hours later, she replied: “Ah so sorry can we meet at the weekend? A coffee one afternoon on Saturday or Sunday? I think I’ve overpacked my day tomorrow and quite jet lagged so my bedtime is early for the next couple of days 🙃”

I’m kind of deflated, I had no other plans, and I was genuinely looking forward to it. More importantly: Was this just bad timing, or is this her way of gently letting me down?

For context: I’m looking for something casual and I’m a virgin. Any advice or honest takes are appreciated.