That comment feels out of context to me.
It reads as if she was having the 'Will you ever return to Buffy' conversation again and came with the usual reply 'Maybe, one day if the part was really well written, but I doubt it. Having said that, the idea of Buffy as an old woman would be very entertaining in a spin-off. Maybe Buffy passing on the role of the Slayer to a younger version where i'd be in it for like 30 seconds. "Oh God, I'll be in a walker. And Buffy will be killing people with her cane. It's not in my immediate future, but stranger things have happened." '
After everything SMG has said, this simply doesn't feel like a full answer or comment just an extract.