WestView Theory #2: Someone Else Is Controlling WestView and Wanda Is Trapped
As WandaVision goes on, it becomes clear that something bigger than Wanda having an emotional breakdown is going on. While Wanda has been able to exert her powers over several events throughout the first few episodes, there are instances (and comic lore) that suggest she isn't as in-control as we've been led to believe. The biggest clue comes in the form of a message hidden within a song from the second episode. The Beach Boys' "Help Me, Rhonda" gets interrupted by someone asking, "Who's doing this to you, Wanda?" The voice sounds like Randall Park's Jimmy Woo, and it plants the idea that rather than Wanda trapping everyone in WestView for her perfect life, she's a victim as well.
The last time we saw Wanda was at the end of Avengers: Endgame, where she was grappling with the death of Vision and the news that she came back five years into the future. We have no idea what could have happened from that point to get her to WestView, but it's safe to assume that it involves Vision in some way because his "resurrection" is one of the biggest mysteries of the show.
As we saw in episode three, WestView is a real place, enclosed within a barrier that can be breached (since Monica Rambeau was definitely a plant). Wanda is aware that there is an outside world but, because the reality is playing out her deepest desire, she's fighting the reality of her situation. But she's likely gotten to that point by someone else bringing her there, and the big questions are who and why.