TMZ: DEMI LOVATO Rejected Help From Her Team Weeks Ago

Demi Lovato ' s team tried to stage an intervention and get her help for her drug addiction , but the singer blew them off . .. TMZ has learned .
Sources close to Demi tell us members of her team noticed she was in a bad place a few weeks ago , and even confronted her about it. We ' re told they offered assistance to get her back to sobriety. The plan was to urge her into a rehab program .
We ' re told the intervention attempt was not successful -- Demi refused and continued to party , instead.

Other sources tell us she tried to make it seem like everything was okay, but her struggle became obvious shortly before Tuesday 's overdose .

There ' s also this -- Lovato and her longtime manager, Phil McIntyre , parted ways a couple months ago . Although neither has said why they broke off their professional relationship . .. we ' re told Phil had a hand in the intervention efforts.