Assalamu alaykum - I met a woman in need and I can’t stop thinking about it

Assalamu alaykum. I know we shouldn’t be alone with the opposite gender and I messed up without thinking, so I need advice on how to move past this “incident.” There’s a woman who wanders the street near my apartment at night. She looked unhoused, so I asked if she was hungry. She said yes, so I took her to the nearby pizza place and bought a pizza. She talked for about ten minutes, mostly asking about my life, my culture, and what I do. I asked a little about her, but she kept most things to herself. A week later she approached me, said hello, and gave me an Arabic-style piece of art she’d drawn with my name on it. As a brown Muslim, that simple gesture warmed my heart, so I took her to a nearby café. Surprisingly, she opened up a bit about her life. She grew up in a broken family. Her mother - the person she loved most - passed away when she was 14. She fell in with the wrong crowd, had to do shameful things to survive, and now struggles with drugs and likely untreated mental health issues. She feels ruined because she has a criminal record and keeps punishing herself. From the way she talked and the pain in her eyes, it’s obvious she’s lonely and has no one to turn to. I’ve seen before that homeless people and addicts can begin to heal when someone treats them like a human and listens. This became a pattern until two men came up to me, gave me a death threat, warned me to stay away from her, and said they knew where I live. They weren’t family - they seemed like pimps or traffickers. I haven’t seen her since, and it’s eating me up. I’m terrified that something may have happened to her because of my involvement. Maybe those men got angry at her “absence” or at her trying to change. Audhu billah - is that the kind of suffering people face in the drug and trafficking world? No wonder she spoke of lighter things to cope. I’m trying to forget and move on, but the guilt is overwhelming. Has anyone been through something similar? How do I reconcile my mistake, seek forgiveness, and quiet this worry without putting myself or my family at risk? What steps can I take to repent properly and to safely possibly help her if I ever find out where she is?