Though she's never dominated at being ranked #1, I don't think she gets affected by the ranking.
Last year she was literally a walking corpse at Wimbledon post RG and clay domination (
) facing the hardest of the hardest grass matchups in Lisicki. RG 08 I can't be too sure, but didn't she have a major lead over Safina before a choke? I wouldn't think she was worrying about her ranking in that match