I do not know what typical drug treatments Sweden offers-

but from the sound of it- your gf is in pretty deep- and not ready to go cold turkey. so perhaps drug maintenance might be a better option for her. In the USA, two major methods of drug maintenance- is Methadone (which i do not see the point of- studies show high relapse, as well as high abuse of methadone), and secondly- a drug called Suboxone. Its generic name is bupenorphine. Over here, there are clinics that administer methadone. There are also doctors that prescribe suboxone. From what i read- i think that suboxone will prevent her from using any opiates on top of it. But methadone- i do not think can block opiates. I do not have enough knowledge to advise you more than that. But... seems that you might get better advice by also joining a drug recovery forum.

You need to join a group that focuses on the enablers/partner/those affected by an addict. I think its called Al-Anon. (not the same as AA)

you're in young love. Not trying to be rude. But one day you will look back on this and say- why was i ever with her. She is an addict, she needs help and all you are doing is prolonging yet ensuring as well- her early death. The only way to help an addict is to hasten their rock bottom- in hopes that they will turn themselves around.

I might be a tad stereotypical with these assumptions- but medical data does not lie. Heroin is the most addictive substance known to man. now- on top of this- question- does your gf take this drug thru needle? If so- then the chances of her ever becoming a long term sober person- has compounded infinitely for the WORSE.

I say in this case- if you love her- leave her.