CNN is saying the daughter did not even give DNA based on some source they are talking to (probably one who is typical of the ultra-sensitive WPD so they gave out false info to try to kill that story), but KAKE says she did, as does the church pastor, who talked to the suspect's wife yesterday.
It is very likely that she did give DNA.
I think it may be likely that they asked..moreso than she came with suspicions and volunteered her DNA. As I said..rumors fly and some are just rumors, some are not.