In a now-deleted tweet, Barr said she told Sherwood she would go to the hospital to check her medications, which she believes were less effective due to stress.
"I apologise to Valerie Jarrett and to all Americans", Barr wrote following the outcry, defending her remarks as a "joke".
"I just wish ABC had not thrown two of the greatest actors in the world out with me-Laurie and John", Roseanne tweeted. "She's not going to go on TV and say these things". Shortly thereafter, her agency, ICM Partners, dropped Barr as a client, and Viacom networks pulled reruns of her show off the air.
"I feel devastated, not for the end of the Roseanne show, but for all those who poured their hearts and souls into our jobs, and the audience that welcomed us into their homes".
Barr has since blamed her behavior on the sleep aid Ambien.
Barr engaged in a series of tweets Tuesday night, hours after ABC announced it was cancelling the rebooted "Roseanne" over a racist tweet by the comedian attacking Valerie Jarrett, an adviser to former President Barack Obama.
Early Thursday, Trump again addressed Disney chairman and CEO Bob Iger in a tweet, demanding an apology for the perceived slights against him from the network. Confusingly, she has also continued to retweet messages that appear to contradict her apology.
"I wasn't gonna get an Emmy anyway", he said.
"It's a meme that she and thousands of her alt-right fans do", Arnold said.
But throughout Tuesday night and the wee hours of Wednesday, Barr went on to retweet a freaky string of Twitter posts - some that called ABC's decision to cancel Roseanne hypocritical, and others that celebrated the sitcom's axing, like actor Charlie Sheen's "good riddance" sentiment. She also added a note that she's the most sad about Jayden Rey, the young woman who played Roseanne's black granddaughter on the revival sitcom.