Can you make a collaborative playlist with someone in a different region

I live in the US and I want my best friend who lives in the UK to be able to add songs to a playlist I’ve made. Is that possible and if so how? When she clicks the link I’ve sent her it takes her to a web page and asks her to sign in and then it comes up choose another country to get music specific to her and when she clicks UK and continue it just takes her off the playlist. It doesn’t give her an option to do any region other than the UK.