Does such a text warrant a reply?? It's been almost 24hrs since.
Yes, it's common courtesy to respond. You did try to confirm too far ahead of time, but not responding is disrespectful. If she never gets back to you then I would suggest not going. No need to let her know you're not going either, if she can't get back to you then it's none of her concern. If this happens and she complains you didn't pick her up, tough sh*t. "Oh shoot, you never got back to me so I didn't think you were in. I made other plans"
But if you're desperate for some action, then by all means text her again later in the week or whatever. I personally would rather fap than supplicate.