Why is this happening in so tired

My daughter sleeps 7/8 ish we have a bedtime routine we follow every night, but the past week she’s been up since 10:30pm till about 2am and then up at 5am for the day. She refuses all naps apart from maybe 1 30 min nap a day…. Yes that’s it She’s getting such little sleep and I’m getting like 2 hours maybe a day What is happening here