Bo Peep's time line is full of mistakes. She was donated nine years before the film. When she meets Woody she says she's been "lost" for seven years. Based on various comments, in that two year time span she was given to a little girl who grew up to not need her and spent years in the antiques store before getting bored enough to go on her own.
At the end of Toy Story 3, Andy's house only has one driveway. During the flash back in the beginning of Toy Story 4, there are two driveways - one leading up to the garage and now one on the left side of the house.
While there were indeed talking dolls with a voice box that is easy to remove if not user-serviceable, given Gabby's age as presumably an early-model Gabby Gabby doll, it would be in reality extremely difficult to remove and reinstall her voice box. Not to mention excruciating for both Gabby and Woody.