I agree...and doesn't Lee also still have a visit this week? We know her dad had his visit already.
Have this "leaked" hours before Cindy goes, but it's non-specific so it's not saying whether the hair was pre or post death...but enough to rile up those "on the outside" and you know Cindy'll make her aware or Casey will somehow have found out. Let them worry about WHAT results came back and what investigators know. THAT could be an interesting tape...although the hidden meaning stuff that seems to go on with them, maybe not so much.
But I do think the timing is intentional...I think they'll make sure Casey hears this (DNA), maybe some backlash from the birthday comment or something, response to whatever Cindy will inevitably say in the next day or so...and all before Lee comes...give her a little time to stew, and then have the person she seems to be most "free" with visit.