09/07/2012 AT 09:10 AM EDT
Robin Roberts has some doctor's orders that most patients would love to hear.
"Doctors orders to put on a lil weight ... that's a first," the Good Morning America
anchor, currently on extended medical leave
to treat her myelodysplastic syndrome
– a week after she said a temporary goodbye to viewers
on the ABC morning show.
Roberts, 51, also said in her Tweet: "Back home in NYC. Will rest a few days ... Transplant now sched for next week. Onward."
Roberts's sister, Sally, is her bone-marrow donor. Together they also faced the loss of their mother
, Lucimarian Tolliver Roberts, last Thursday, Aug. 30. She was 88 and had been in ill health.
She has since paid tribute to her late mother on her Facebook page
, writing on Sept. 4, "Momma found a way to be with me every step of the way on my journey. I am humbled by her selflessness."
"Today I was supposed to be admitted to the hospital," Roberts continued at the time. "Instead I am here in Mississippi standing proudly with my family as we honor our beloved mother and celebrate her life. When I return to NYC and walk through those hospital doors next week momma will be right there with me."