Unknown language speaker: Amy Macdonald

Holy cow, I'm watching Top Gear S19E03 and the guest tonight is Amy Macdonald. What language does she speak? :)
She pronounces so strangely, I can't understand. When she said 'I did', it sounded 'I ded id' and instead of 'first love' she said 'fast lov' and 'succesful' as 'soekhsessfjul' and 'sitting' as 'setting' and 'busy' as 'bezi' and 'were' as 'where' and 'Stig' as 'Steg' :D:D. Does she know which letter is actually written in that word? I reckon I speak and sound better even that I am not native.
I know that in every country there are accents but this was a total different language. She actually said that whole Britain is laughing on her. Doesn't she have to take lessons of the English language? :) Anyway, who is she? What does she do for living?