Could have been worse (Myskina) and better (Black), but Elena L. is certainly someone she should be capable of beating on a good day. You are right, of course, GoDom. Losing to Pierce is not a disaster. She wasn't favored to win the match, even if Mary has been supporting Burger King a bit too enthusiastically. But it was just one of those occasions where you really feel that a prominent scalp eluded her...
BTW, if she beats the 'Likhtser', Henin is next. Ouch.