You didn't do anything wrong. In fact, awesome job all around!!!

When women (and, I assume, men) tip over the line of what they're ready for, it's quite unpleasant and scary. But you didn't *do* that to her, and she knows that. But it was intense, and it made her need some alone time. And/or she felt like she'd let you down by not going further. (Slick move for next time: after you stop and lay back down, hold her hand so that she knows that you're happy and still like her. If she's feeling shy, she may pull her hand away. That's fine. It doesn't mean you did something wrong.)

Text her that you had a great time, you really like her, and would she like to go to a diner with you?