Need to turn off my daughters find my iPhone but can’t do it from her phone

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

focus on the

If you no longer have your iPhone, iPad, or iPod touch

section

my phone is broken and to get a new one I need to turn off find my iPhone but I can’t get into my phone how can I turn it off

Need to turn off one of my phones that don't work

as I wrote where I posted the url

click on the blue text

your browser will navigate to apples support site

scroll down the page until you reach

the section with the text

If you no longer have your iPhone, iPad, or iPod touch

the same procedure for an absent iphone as with a broken iphone

need to turn off "find my iphone"when iphone is not functional? How to do from macbook pro or dell tower. Appreciate your assistance.

Where to I get an answer to my question need to turn off one of my phones that don't work anymore