Note that Douglas County is adjacent to Leavenworth County. Phebe Kendall is listed in the 1860 US Census in Douglas County as 14 years old. Phebe Crawford is 24 years old and born in Kentucky.
William Crawford is listed in the 1860 US Census with Phebe Crawford as his 17 year old wife with a 7 month old child, so I think it is safe to discount Phebe Crawford as the Phebe Kendall I am looking for. Not because Phebe is 17 years old, as that is likely a fib as she is likely 14 years old and doesn't want to admit it. The following lists Phebe's age for each census.
Rather it is the 7 month old child. I think there would have been a shot gun wedding a bit sooner, but I could be wrong!