Does anyone know how fast Rachael Alexandra has been in her last 1/4 mile in her best race?

Mine That Bird's time was 23 & 3/5 seconds the last quarter mi. of the derby on a sloppy track. He was second to Secretariat's time of 23.0 on a dry track. I found that pretty exciting. I've been wondering what Rachael A's chances are and thought someone would know her best speed so we actually can compare the two.