Pronunciation and accents

I was asked by a student to teach her better pronunciation, she wanted to sound like a native English speaker. I will correct students' pronunciation when it's hard to understand, but when a student is producing the target language correctly, and can be understood, then I don't interfere. Some people do have the goal of sounding like a native speaker, but the question is, which native speaker do you want to sound like? The Queen? Theresa May? Me? Essentially I think it boils down to accent, and which accent you want to speak with. My personal opinion is that I like regional accents, it reminds us of our origins and is an easy conversation starter when you meet someone now. I've never tried to change my accent, although it has changed over the years as I have lived in different places. So to change the accent of a student, more than merely helping them to say a particular word, I feel this is out of my remit and more for a voice coach to work on.