SAK says on 12/Oct/11
Yeah she is 5ft7.5 and Eva was around 1" shorter at 5ft6.5".

Matthieus says on 12/Nov/10
I think for most cycles of ANTM 5'7'' is the minimum height to be eligible as a contestant, however there has been some debate about Eva as she was roughly 5'6.5'' and not only got on the show but won.
I can believe Yaya is around 5'7''-ish as when she was in the final three with Eva and Amanda, who looked of similar height, Tyra Banks congratulated them on making it that fair and the fact they were also the three shortest girls that cycle.