She (20F) never responded to my text. Did I (20M) do anything wrong, or is this beyond my control?

So I've been getting subtle but solid hints from mutual close friends of hers that Girl A likes me. I've known her for about a year, and hang out occasionally through mutual friends but never alone. I run into Girl A and a two of her friends at a local cafe. The two friends quickly leave, leaving me with Girl A and we talk continuously for two hours or so. I ask for her number, which she enthusiastically gives out, and say we should get coffee again soon. We do get coffee two more times (once albeit incidentally), with the same chemistry. As we're about to part ways, I ask if she'd want to go to one of these monthly art walks my city has. She cheerfully agrees. Fast-forward 11 days (post-Thanksgiving break) and I text her the following:

"hey do you remember when i asked if you wanted to go to art craw this friday? (if not, you said yes lol). Anyways i wanted to see if you still wanna go/work out the details."

And she never responded. Now she normally takes a while to respond, but she gets back to me before the day's over. Did I do something wrong here? In hindsight, the part in parentheses may come off as needy. If she had been honest and said no, I would have been okay with that. However, not responding at all irritates me.

Am I to blame here? Should/should have I texted her again?

TL:DR I text a girl (with whom I have pretty solid chemistry) to confirm/coordinate a date that I already asked her on, but she doesn't respond. Did I screw the pooch, or is she just being a bitch?