I have paid for her to go back to poland for detox so I am not to blame!!!
That might be why her Mom is upset. Parents often don't want to be confronted with their children's problems first-hand. Some feel it is an indictment of them that their child isn't "perfect." You put this back in her face, so, since she can't display anger at her daughter, she's displacing it to you.
On the other hand, she might think you're "dumping" her daughter on her, rather than taking care of her yourself. Or maybe she blames YOU for her problem - heaven knows it can't be HER child's fault. My parents always blamed my friends for all of our problems and troubles - again, displacement.
Give it time. The Mom and your girlfriend have a lot to work out between them before you can be brought back into the picture. She's detoxing - it might be time for you to find a support group for yourself. Check with your local Narcotics Anonymous groups to see if they can refer you to a group for friends and families of drug addicts. If you don't take care of yourself, you'll be a lot less useful to her.