The shadow business secretary says independence would be for the people of Scotland to decide.
Ex-justice secretary Kenny MacAskill - and newly-elected MP - said a longer wait is 'no bad thing'.
Holyrood backed the Referendums (Scotland) Bill at its final stage by 68 votes to 54.
The UK Government has ruled out a second Scottish independence referendum.
On Scotland Tonight, the SNP leader was also quizzed on indyref2 and her domestic record.