ESA Medical Question(s)

Hi, I am hoping that somebody might be able to help me. I am writing on behalf of my Mum who was denied ESA initially but had a successful tribunal hearing in September where she was placed in the WRAG. She received a Work Related Capability Assessment form at the beginning of January which we have completed and she has since had notification to attend another Medical in a couple of weeks time.
Is this the ESA procedure starting all over again? I vaguely remember somebody saying after here appeal hearing that she would need to attend work focus interviews but has had nothing like this since the Hearing. What happens after the medical, do the interviews take place then or is the dreaded saga starting all over again? I truly hope note as I'm not sure my Mum is strong enough to go through another tribunal.
Any help would be greatly appreciated!