She emerged onto the scene after her father died while he was being arrested at Victory Boulevard and Bay Street in Tompkinsville for allegedly selling loose cigarettes in 2014.
"It's just sad to see her laying there and not the active Erica that we know", Sharpton said.
Erica's father's death in 2014, drew heavy anger after a grand jury in NY declined to indict Officer Daniel Pantaleo, who used the chokehold while attempting to arrest Garner for allegedly selling untaxed cigarettes outside a Staten Island store.
She came to prominence three years ago after her father Eric Garner died while being choked by a police officer as he was being arrested for a minor offence. She cared when most people wouldn't have.
Garner suffered her first heart attack shortly after the delivery, with doctors saying the pregnancy stressed her already enlarged heart. A Justice Department probe into Garner's death has yet to conclude.
Erica Garner became a voice for police accountability after his death, criticising Mayor Bill de Blasio over policing matters. One thread of messages claimed NYPD officers kicked everyone out of her hospital room despite the fact that they were allowed to be there.
Since her father's death, Erica has had two children, including a child in August whom she named after her father.
"People are dying", Garner said in the video. She endorsed Democratic candidate Bernie Sanders for president and appeared in an campaign advertisement for the senator from Vermont, who posted a statement on Twitter earlier in the week in response to the news about her health. A grand jury in December 2014 decided not to press charges against Pantaleo.