Bearded dragon lights Left on for 3 days?!?

right now I'm at the beach and my mom and I are staying for 2 nights. I left my beardie at home and my plan was to have my sister turn on and off the heat. She has her own place now but I thought maybe she could stay over. Well something came up and I thought it might be ok to leave her heat on for just one night because my beardie sleeps well even when the light is on, which is a bit weird, most of the time she'll go to sleep before I turn the lights off. So I asked her to just go home and stay over for one night to turn and turn off her heat. She probably won't forget but if she does, what will happen to my bearded dragon?? Will she be ok? How do I get her on her normal sceduele? Ps. I Will get a timer the next time we are on vacation. Thank u!