Dating someone with substance abuse problems, how to help them?

Recently started seeing someone that openly admits to having substance abuse issues in the past but has had multiple relapses. Usually when things get hard from work or other stressors in life. She’s had a history of using street drugs, alcohol abuse, meth, and opioids/painkillers. I love her for who she is but know she can do better without the drugs taking over her life. If you didn’t know her well, you would think she is a great bartender, personable, and has a good head on her shoulders. Her ex boyfriend is in prison for drugs and I hope that is enough of a wake up call. What resources besides court ordered treatment can I find, and how to approach the situation? I am in the US if that makes a difference.
Dating someone with substance abuse problems, how to help them?
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