Diane Abbott is facing calls to step down after missing Brexit vote
Ms Abbott claimed she was too sick to attend the Commons and nail her colours to the mast.
Colleagues have said she should now be made to quit her position as shadow home secretary.
Jeremy Corbyn called a three line whip over the vote calling on MPs to back the Government’s plans to move forward with Brexit.
He was defied by 47 Labour MPs who voted against the Brexit bill.
On Thursday shadow chancellor John McDonnell said rebel backbench MPs would not be required to resign for the refusal to come into line with Mr Corbyn – but members of the shadow cabinet would.
Diane Abbott did not take part in the Government Brexit vote because she was ill – Labour said
- Diane Abbott lost for words defending Labour's by-election hopeful
- Question Time audience member tells Abbott Brexit will END Labour
Ms Abbott, a close ally of the Labour leader, failed to vote after complaining of a migraine and leaving Westminster two hours before the division in the Commons at around 5pm.
Her position has been met with a backlash from MPs.
Labour MP John Mann said Ms Abbott's position was "outrageous" given that at least four "very, very, ill" MPs, some of whom recently had life-saving operations, turned up for the vote.
Three shadow cabinet members resigned from the frontbench before the vote so they could defy Mr Corbyn's orders and oppose the EU (Notification Of Withdrawal) Bill.
Mr Mann said he suspected Ms Abbott also wanted to abstain or oppose the EU (Notification Of Withdrawal) Bill but lacked the integrity of her colleagues who quit.
Get Quotes on Home Insurance
Jeremy Corbyn and Diane Abbott are close
- Jeremy Corbyn changed migration stance after 'call from Diane Abbott'
- Tory MP Jabob Rees-Mogg shuts down Remain heckler for BOOING Brexit
Jeremy Corbyn in pictures Tue, July 12, 2016
Labour Leader Jeremy Corbyn takes part in a community meeting at the Guru Har Rai Gurdwara Sahib temple
Reuters 1 of 36
Britain's opposition Labour Party leader Jeremy Corbyn speaks at an anti-racism rally in London
Jeremy Corbyn and the shadow cabinet decided the party position
John Mann MP
He said Ms Abbott may have been feeling the pressure of her local party in Hackney North and Stoke Newington, who nearly mandated her to vote against the Bill.
Mr Mann said: "She thought she could get away from it.
"Others have the integrity to resign from the shadow cabinet.
"I disagree with their vote but not with their integrity.
"Jeremy Corbyn and the shadow cabinet decided the party position.
"She is in that shadow cabinet."
Mr Mann went on: "If she had been rushed to hospital, then of course that's perfectly rational and reasonable.
"But I think she should apologise to the party for her actions and she should resign".