It's gonna be a wee bit tricky since Amanda has already died as an old woman by the time of Aliens. And if Burke told Ripley a little fib she's still gonna be a rickety ol' granny since this is evidently a sequel to Aliens. Nevermind the strong possibility that Alien 5 will likely be set an additional 30 years after Aliens
And no, just no to flashbacks, time travel or keeping Amanda in cryosleep and all that convoluted shit.