Daddy hasn't plead guilty or been convicted yet.  

The daughter could be subpoenaed to testify against him.  And held in jail until she did.

It's called being a 'material witness'.

"Oregon man commits no crime, but held in jail for 900 days"

http://www.oregonlive.com/portland/index.ssf/2015/03/oregon_man_commits_no_crime_bu.html