I think one reason she lost attraction/attention is because... well let's look at your text conversation for example:
Quote:
I texted her to see of she wanted to hang on Friday. She responded with a maybe, what do you have in mind?"
Me: was thinking we could chill at bar x. Say at 7. Up for it?
It's bland and nothing unique. How many guys do you think boringly text her "what's up?" or "hey, you wanna meet up"? You gotta spice it up, be more playful, and intrigue her. When she says "What do you have in mind?" say something different like "I have quite the
adventure planned. We're going to go on a safari through the city and people watch, followed by an
exotic dinner... and if you're lucky, we'll catch the last flight to paris and get married". After I typed that it sounded stupider than I intended, but whatever. The point is to inspire a different reaction then "...eh, a bar. I could take it or leave it". I have a reponse I use all the time similar but shorter and it works pretty well. I don't want it on public domain, but you have the gist of it for making your own now.
Quote:
Her: I just remembered that I'm meeting a friend to hang with him tonight.
Maybe it's just me, but I get the impression she didn't 'just remember'. She probably was going to meet up with you until someone else texted her and gave her a better or more fun alternative. Doing something similar to what I said above may help this.
Quote:
Her (3 hrs later): sorry, I had a lot To talk through tonight.
Me (the next morning): no worries. It was a lot of fun though... Maybe some other time!!
She baited you all night and you just said "okay". Instead of brushing it off, you could have playfully insisted she had to make it up to you.
Those are just some initial thoughts. I understand tonality is harder to convey through texts., but you just gotta set yourself apart from the other seven guys texting her. Why should she respond to your text and commit to your plans over theirs?