Vader was able to figure out who Leia was, but couldn't read minds? I guess you could pretend he didn't and was just bullshitting, but I doubt it. Besides, Rey had zero training and was able to do it. It's more likely that Lucas didn't have the concept of the Force down at that point, and Disney doesn't care.
Originally posted by ares834
Vader says it. "You're thoughts betray you."
And Rey could do a lot of shit without training. Honestly though, just seems she reversed it on him via the connection he made.