Proof? lol there’s a video of every second of it.
When there's no referee and it's an obvious foul I think the player at the table should be responsible for knowing they fouled. So, even if JB somehow didn't know that she fouled, I think she should have been paying attention and should have known that she fouled.
If LJ had asked JB after the shot, for example, whether or not it was a foul, I think it would be JB's responsibility to tell her that she did foul, which of course would require knowing that she fouled, and so paying attention during the shot. The player not at the table simply may not be in a position to see whether or not it was a foul.