First, using a stunt double instead of Bailey probably saved them some money.
They could use a stunt double for Bailey just as easily as they did for Ginny.
I imagine that child stunt double cost more than an adult. Besides, though most girls stop growing at 16, some like myself stop at 14.
Regarding Lana’s voice, you don’t need to deal with a can of worms just yet. The only thing you need to disregard is Lana’s choice that was dependent on what she knew at the time. If her choice was due to being told to be the EQ, then yes, we should be irritated. However, if you read my post above, to make things fit you could say that her EQ voice could have been due to a temporary darkness from losing Daniel a second time.
Regarding Aurora, her being cursed is definitely a plot continuity error as in …a cause and effect error. It might not be a timeline error though. Unless of course the writers plan to show her being cursed several times and her most recent one was a sacrifice, but I don’t think that this is the case.
Keeper of Regina's bravery