Having a young teenager it pays off to have a hair straightener that has a security automatic shut off function like this ZoiyTop Straightener does. It is the perfect size for her to handle and works good on her long hair, she is just starting to do her hair every morning before she goes to school so it is important to have a good iron that will be effective and work rather fast like this one does.
This iron has 6 different settings so it works well with all types of hair so you don't have to worry about burning your hair up if you have dry hair or really thin hair, the iron can be turned down to where it will not do any damage.
So far she has really found this iron to be easy to work with and the perfect size for her small hands. I would definitely recommend this ceramic hair straightener.
https://www.amazon.com/Ceramic-Straightener-ZoiyTop-Professional-Infrared/dp/B076Q1WTB8