Combinations - Possible conflict subutex and morphine

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Your input is greatly appreciated here. Swim is a long term subutex user, recently addmitted to hospital with various serious health complications. Due to severe chest pains was put on morphine on top of her subutex. Eventually a dugs worker at the hospital pointed out that subutex is a partial blocker. She was taken off subutex and her morphine upped to 250 ml. On discharge from hospital her 8mg subutex script is back and she is on 100ml oral morphine.

Can someone explain how much of the morphine could be blocked. She is complaining of symptoms which sound like withdrawl and still in considerable pain.

She has a GP appointment tomorrow (friday) and would like to attend armed with some knowlege to educate her GP.

My unprofessional diagnosis would be to remove the subutex, but then what do I know? I havent been to med school.