This is the first time she has spoken at an independent rally since 2014. While addressing a gathering at the heart of Glasgow, Scotland she said the independence of the northernmost country is very near which will be a victory for the nation.
Thousands of independence supporters have heard Nicola Sturgeon call for "Scotland's future to be put into Scotland's hands".
Asked about the issue on Sunday, Ms Long-Bailey said her party's position was to wait until after the 2021 Holyrood election before granting a Section 30 order.
The first minister told the masses that the election was " The most important Scottish election in our life".
"But all of us must make sure that over this next few weeks we persuade everyone we know, our family, our friends, our neighbours, our workmates, to come out on December 12 and send the biggest, loudest, most resounding message to Westminster that it is time for Scotland to choose our own future, it is time for Scotland to be an independent country".
"After the next Scottish Government elections, if the Scottish Government determine they want to pursue another referendum and they go through the legislative process within their own government to push that forward, than as a government we wouldn't stand in their way", she told Sky News.
She said: "Our future is on the line and it's a choice of what kind of future we want".
But Ms Sturgeon insisted: "The better alternative, the much better alternative for our country, is to take our future into our hands and to become an independent country". "There is no doubt that Scotland is at a crossroads".
There were boos from the audience when she claimed a victory for Boris Johnson in the election would result in "a future where Scotland gets ripped out of our European family of nations against our will, a future where the United Kingdom turns in on itself, a future of a hostile environment for migrants".
The SNP leader said she wants Scots to "demonstrate the desire" for independence by voting for her party, adding that opposition to another referendum is not sustainable.
The first minister's speech came after she confirmed that she would send a letter "before Christmas" to whoever is in 10 Downing Street, requesting the Scottish Parliament is granted powers to hold another independence referendum.
Labour leader Jeremy Corbyn.
The rally today, organised by Scotland's only pro-independence daily newspaper the National, will also be attended by fellow SNP politicians Mhairi Black MP, Justice Secretary Humza Yousaf and Scottish Green co-leader Patrick Harvie.
"I think the better option is to labor the entire British government".
The Tories criticised Nicola Sturgeon for prioritising indyref2 "above all else".
Annie Wells, Scottish Glasgow Conservative Party MSP, said: "Although Nicola Sturgeon promotes indyref2, I talk to people about the situation of local schools, drugs".
Writing in the Scottish Mail on Sunday, he said the Conservatives are "the only party which is strong enough to stand up to Nicola Sturgeon - and stand up for the majority of people in Scotland who are sick and exhausted of her independence obsession".