as an ex user, you can't be around that stuff. it isn't being ingested, iit is being inhaled as a smoke and there is zero chance that others around her aren't also inhaling it involuntarily.
so, as much as you might like her, it is based on the first visit when she was (almost) behaving as a professional (rambling on with her sad life story, to me, is just a hustle, but i'm a cynic, and i feel she was trying to solicit sympathy in the way of another appt or extra $$ at the end of this extended session).
she's not your friend, you shared a moment, time for you to protect yourself and your health and move on away from that drama. she had zero respect for your health or your sobriety when she lit up the crack pipe all night long, you owe her nothing.