There is only so much you can do for people determined to destroy themselves. Also, Howard was the only cast member to go on to make mega bucks as a Hollywood director. The rest stayed relatively small time, so they may not have had the means to give as much help as she needed.
She had sued the HAPPY DAYS people and got $65,000 in 2011 or '12, but blew that money long ago and declined T.V. work that Winkler tried to get her. She was married, a drunk, and now, it is being claimed that Erin died of a heroin overdose.