My girlfriend I phone xr is hack now she can’t long in

If she has changed her password, have she followed the steps in this article?

What to do after you change your Apple ID or password - Apple Support.      

What is it she can't log into?

She might try using What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touchhttps://support.apple.com/en-us/HT201351. But, maybe she'll need to contact Apple Support. Here are some options:

Get a call from Apple support to help solve your problem using this

link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and

region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through

the options to find the best support option.