Manager called during my medical leave

I've been on medical leave since mid-January. It's supposed to end in May but I have absolutely no intention of going back to that job. I'm autistic and the store is too overstimulating for me, so I'm looking for something that will accommodate my needs. My manager left me a voicemail a few days ago asking when I was coming back since my leave is “almost over” (still have a month and a half) I have no idea what to tell her