My grandma's 2011 Honda CRV isn't TURNING ON?

I'm CLEANING HER CAR RIGHT NOW. I put my phone on the aux cord and let the music play while I was cleaning. The key was on second notch to let it play. After an hour or two I noticed the music stopped. I thought it was a timeout so i left it like that for about 20 min and turned to the second notch and the radio didn't come on but the gauge cluster lit up. I got a little more worried and i tried to turn the car on to test it and wouldnt turn on! I feel like I blew the battery? The engines and stuff is all good. I'm so scared. What do I do? I need help becore she finds out!

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