Cool down. She may choke, but this isn't that weird. It has happened a lot with other players (Martina Hingis comes in the mind). She wasn't serving for the match or set, so it really isn't that bad. Lindsay was better even while she was "injured" so "badly".
Actually, Linday has been a bit of a choker herself today: she had a tournament point in the second tie break and couldn't convert it. She was so close to winning her first title this year but just could do it. I find this a lot worse than Justine's case yesterday. One point and Lindsay won Zurich and didn't lose points. With Justine: if she would've won the second set, she would have had to play a third and it wasn't sure if she was going to win it.
So all players can choke. Justine a bot more than the others, but that's her. If you don't like her like that, welll ... you shouldn't like her at all.