Why does she randomly stop replying?

I've known this gal for about a month and a half, and we've been on one date. Some days, we'll text or snap non-stop from sun up to sun down. Other days, she'll just randomly quit replying, and it'll be hours before either her or I start up again. She seems interested because like I've said, we've done a lot of communicating and it's been good. But I can see her always on the move on her snap map, so while I give her room when she quits replying, I know it's not because she's busy and isn't on her phone. I know she doesn't "owe" me any replies, it's just simply peaked my curiosity.
Why does she randomly stop replying?
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