Re: Change of events
If that breast has been filling up all day, the milk may have gotten salty, which might explain why your LO won't eat from that side. (The longer milk sits unused, the more salty it gets; there's a technical explanation for this which I cannot recall at this moment.) I'd try draining it via hand expression or pump, and see if that restores your LO's willingness to nurse from that side. You could also try different positions and see if that makes it easier for baby to nurse on that side- perhaps she can't breathe when lying on one side, or maybe her ear hurts when she's on that side, and that's why she's reluctant to nurse off that breast.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"