I don't have much to add, just to echo the comments here, they are flakes. Getting a no reply is normal behavior. Sometimes they can ghost for a week (or more), but you try the next and it's like nothing happened. No sense of etiquette or responsibility.
It used to get me all messed up, wondering how they thought this was an adequate way to function. Now I don't give a shit. I just assume no reply and move on to another, maybe try again next week, depending how much (or little) I wanna see them again.
The no reply or flake can be for any number of reasons, or no reason. It's not worthwhile to even speculate.
If you still wanna try again, give it a few days or week, then try again. Or just pass, it's up to you.
Advice: Assume no reply, and try not to get worked up at all when they act like flaking is normal or whatever, you'll drive yourself insane if you care in the slightest about getting common courtesy from these girls.