I don't think so.

Aren't most of her criticisms rooted in her being a Mary Sue?

Well, her rise to a hero story has already been told and that's where you would fix that. And she was a mega-power from start to finish. That's what would need to be fixed.

When she was criticized after The Force Awakens and rumors were flying... people thought, "Oh, she must have already been trained. She forgot, or her mind was wiped to protect her."

Nope. Just a Mary Sue. I guess they could still implement something like that though. But it would be a Prequel child Rey series.

i.e. Palpatine tries to train his granddaughter. But her future is clouded. He senses too much good in her. He refuses to train her and wants her killed off but, she survived and the sequels happened.

Let me just say, I love Daisy Ridley. I remember watching The Force Awakens, and got such a crush on her when she's sitting there with the rebels helmet. I was rooting for Rey. But she's a bad character.

The sequel trilogy did almost every every single character dirty.

• Rey = Mary Sue
• Finn = Who? Was he in it much after The Force Awaken trailer?
• Poe = Likeable with funny quips in TFA.. so lets drown the audience with that. Unbearable.
• Rose - Credit for walking away from that train wreck
• Han = He was enjoyable as always. So kill em. Out with the old. Let's take the simplest, dumbest route to make us hate Kylo Ren. (It's probably what Ford wanted anway so maybe give that one a pass)
• Luke = Completely bastardized his character and story in order to try to build up Disney's new characters and unoriginal story.
• Leia = She was actually fine imo. Other than her freezing in space-force drifting.
• Ackbar = killed without significance paid to him
• Anybody read the Aftermath trilogy in order to hype themselves up to the new Trilogy? Fill in the gaps? Temmin "Snap" Wexley.. another character killed off like he was Rebel soldier #345,567,396

The simplest most satisfying "fix" is to just call this the "Star Wars Visions of the Future" Trilogy. It's Star Wars. Its entertaining here and there. Just not canon. Not yet.