My phone updated, then it froze!

Hello, I’m making a report for my daughter. Her IPhone was getting a update so she can stop having bugs on her phone. Her brother told her that she should leave her phone alone. And let it update overnight. She noticed that it was “frozen” on the same screen, with the apple sign. And the loading bar. By her clicking the side buttons, it made it worst since it was updating. It’s been like this for a while now and I’m very afraid that her new phone is broken. If it’s not and it is easy to fix the update and the frozen screen. Replying to this, and telling me the info I just know on fixing the problem. Thank you, my lovely IPhone Helpers!🙏❤️ Be safe and Healthy.