For the Dark Fairy's role to have been stolen by the Evil Queen then the cursing of Sleeping Beauty must have happened some time past graduation, this makes some sense given that Briar hasn't been cursed yet I guess, and we're given an explanation it all going down on Sleeping Beauty's 18th birthday party, which is also fine.
But given the Evil Queen's age isn't in the hundreds, Briar's mother can't have actually fallen asleep for hundreds of years, and Briar's age relative to Raven's suggests that Briar's mother wasn't sleeping for vary long at all? Briar's parents probably went to school together and their friends are likely all still alive. It would even make sense that this is what happened because it explains how the Evil Queen managed to go an extra eight-plus years until the Invasion of Wonderland until she was actually arrested for interfering with stories; if the outcome of the first time she did it allowed Sleeping Beauty to avoid the actual horror of her story unfolding the way it was supposed to.
But Briar's fears are still based on the idea that her mother did sleep for hundreds of years and all her friends are dead and she did end up being married to a man she had never met before. Which, don't work with the timeline. At least let her sit at a table listening to her mother recount stories with her friends during a dinner party and lose her appetite as she realises she won't be able to do the same because the Evil Queen broke script for her mum and isn't around to break script for her.
Or maybe Briar has heard the stories about how hard it will be from her Grandmother, who only had the two children before her husband died in an accident that may have not been an accident, and Briar can't help but think she might be trying to mentally prepare Briar for the worst even as her friends and mentors brush the stories off as the kind of stories old people tell to scare children.
But you have to pick whether Briar's mother did sleep long enough to get that trauma from her, or if the Evil Queen stole the Dark Fairy's role. Because the Sleeping Beauty story has to have happened before Briar was born, and Raven was eight when the Invasion of Wonderland happened. So every year that Sleeping Beauty was asleep for is another year on top of 8-9 that the Evil Queen got away with interfering with a story before everything with Wonderland. And every year Sleeping Beauty is asleep is another year that every other kingdom has decided to let the Evil Queen carry on without being arrested given no one during that period of time knows what the outcome of the Evil Queen's spell would be when the Dark Fairy's spell is meant to be the safe one. And every year that Sleeping Beauty is asleep for is another year added to the age of all the parents, even if Sleeping Beauty herself doesn't age.
I don't think she was asleep longer than a year at most.
We also know that the Snow White story had to have happened before this as well. So imagine being the newly crowned Queen White, who is eighteen. You've pardoned your step mother for her actions against you because they were made for the sake of the story. She's also eighteen, you argue, and she's married to your dad who may be a good man but is at the very least 36 but probably more likely in his 50s (assuming he didn't get married as soon as he turned 18, and that you weren't conceived an born that same year, supposedly the Good King has a naval career, and you might even have older siblings who would later die fighting your step-mother: someone had to be assumed heir to the Good King's name after all) in what was for all intents and purposes an arranged marriage [I like to think it was a genuine arranged marriage the Good King didn't want but also didn't want to go to war with the Evil Queen's father whoever he may be, but the Storybook of Legends is also playing matchmaker here so].
Then she curses someone who was probably your friend in school.
A fair few people are blaming you. If you hadn't let the Evil Queen run free instead of being locked up, or even killed, for her crimes the story would have happened the way it was meant to.
What else can you do but point out that the Evil Queen is still the Evil Queen, and the spell that put you to sleep was able to be broken with True Love's Kiss. There isn't even a time limit.
When Sleeping Beauty wakes up she's overjoyed that it hasn't been that long at all.
When Briar finds out that Raven's page said she'd interfere with the Sleeping Beauty story as well and Raven is refusing to do it, she might well be angry.