As far as I know, there is still no proof that Elizabeth Yeardley married Joseph Croshaw. She has been attached and detached from Joseph Croshaw a number of times, and as of today, she's back again.
Wikipedia has been edited to show her as Joseph Croshaw's wife, but Wikipedia's sources do not support the claim. (Anyone can edit Wikipedia--please use it with caution.)
http://www.genealogy.com/forum/surnames/topics/yardley/294/
http://www.genealogy.com/forum/surnames/topics/yardley/311/
For what it's worth, "Adventurers of Purse and Person Virginia 1607-1624/5" by John Frederick Dorman, Vol A-F, states Joseph was married 5 times and that most of his children are from the 1st (unknown) wife. It does not list Elizabeth Yeardley as a wife.
@Elizabeth Croshaw
@Maj. Joseph Croshaw