I get the vibe that you're going the "low key hangout" route instead of the date route and it doesn't seem like you've really hit on her or displayed sexual interest.
If you continue down that path, you're are headed toward the friend zone, which is why I am not a fan of the "low key hangout" route. I always tell girls we are going on a date.
So, with that said, a good thing to text girls the day of the date is something like:
Me: Hope you're ready for our date later
Her:Oh Im ready

Me: Well look, I do expect you to be wearing a Cinderella dress and glass slippers. When I pull up, just look for the guy in shining armor on a white horse, that'll be me

Her: Haha blah blah blah
Something like this allows you to make sure she hasnt forgotten about the date and the playfulness helps to get her in a good mood with good feelings towards the date PLUS when you meet up, you can quickly get rid of any jitters or nervousness she or you might have about the date, by immediately going into a roleplay/playful banter:
Me: HEY! You're supposed to be wearing glass slippers. Tisk Tisk.
Her: Well wheres you're horse and shining armor?!?
Me: I left it in the car. The horse is in the backseat. I might get it out later, if you're good.
Theres nothing super special about any of those lines, but they are playful, so they are good for before the date and at the beginning of the date to get that good energy flowing and that first text lets you know that she still has the date on her mind and is going to show up.