What he says is...
Dr. Strange: Help me bring her back.
What she says is...
Ancient One. I can't. No one can. Her death is an absolute point in time.
There is no implication. She says straight out that nobody can change it.
I misspoke. It was not an implication. It was simply logically incorrect. Or a lie.
She tells him
exactly why this absolute point can’t be changed: because it will mean Strange never becomes the Sorcerer Supreme. The word “paradox” comes out of Strange’s mouth, not hers, but he is clarifying what she is talking about.
But it’s only accurate for Strange. If anyone else were to try, it would not be a paradox.
Either she is
wrong about the cause of an absolute point, or she is wrong (or lying) when she claims that
no one can change it. Those are the only two possibilities.
My money is on her lying, but that’s just a guess based on her behavior across all of the timelines we’ve seen her in. She
wants Strange to become Sorcerer Supreme. For good reason, of course. Defeating Dormammu would be reason enough alone.
* Okay, one more possibility: she is right about the cause being a paradox
and right that no one can change it, but for unrelated reasons. In this case, where she is wrong is in stating that the cause of the absolute point (paradox) is meaningful in any way). This seems far-fetched to me, but the multiverse
is a strange place. No pun intended.