Girl at gym gives me her number without me asking, ignores my text the day day?

So I go to this gym a a lot and this gurl is fairly new, i think as i only saw her recently. Only met her 3 times before she gave me her number.

1st time - we were taking turns to use the same machine. As courtesy, we set the weight back for the other person to use, and i kept forgetting her weight and we both laughed. Thats it.

2nd time - we worked out next to each other. As the day went on, i noticed her check me out a little. Thats it.

3rd time - we worked out next to each other we exchanged looks and she smiles at me, i smiled back. On the way out of the gym, i just asked her about her training, we talked briefly and she offered to give me her number in less than 2 minutes! But we went on talking a little longer. She said that we should workout together and that i should go to see her in a powerlifting competition this weekend. We exchanged numbers and I left. I texted her the next day to ask if she is going to go to the gym tomorrow, and she didn't reply for hours?

Even if she wasn't romantically interested in me, she'd at least tell me whether she is going to the gym, no? I actually intend to take things REALLY slow with her, because it's the gym. I don't mind even becoming just friends with this girl. I'm not desperate. But I just thought that a girl giving me her number without me asking was a little refreshing. Also if it helps, she's 21.

So why would she ignore me?
Girl at gym gives me her number without me asking, ignores my text the day day?
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