Ex dancer calls for a "session"

Had 2 OTC's with a dancer who worked at my favorite club. She quit the club, got messed up with drugs, asked me to take her to emergency room which I did. I tried to keep in touch but her sister wouldn't let my calls thru. In August I left a message on answering machine that the hospital had called trying to reach her about paying the bill. Ex dancer calls me & tells me to don't bother her anymore calling me a psycho. I email her saying I'm the psycho she called when she needed a ride to the hospital, etc. 5 months go by & out of the blue she calls telling me she's now working at a fitness center. She texts me the same day asking if we can do a "session"(OTC) as she's broke. I text back where & when. She calls the next day for the location and the session happens. As I'm leaving she asks about doing dinner. I text her later about doing lunch. She leaves a voicemail that she would love to do lunch & to call her back which I do. I leave a message but she doesn't call back. I call her about lunch on Tues but no reply by text or phone. When she first called she told me not to call at work but then later said it would be OK but don't call a lot. Do I call her at work or just forget the whole thing? I would like to keep the "session" thing going. Or just wait & see if she calls again?