We don't know what has happened. I also don't know her opponent. Fact is that her serve didn't work well. She made less than 50 percent points by her serve and by second serve just 6/26 points at all! So you cannot win a match if you hit only 59 percent first serves. Then she had 9 double faults. Maybe her opponent was stronger than expected. But for sure it wasn't her day. Maybe she was too nervous because of being favourite in this match.
She hasn't twitter or facebook so she won't tell us her view?