i would make sure she takes it. Force feed it if I have too.
You're gonna follow a chick around every single day, throw a pill in the face, hold the mouth/nose closed like a puppy and check under the tongue after?
That's just irresponsible thinking.
That 98% effectiveness associated with birth control pills counts on the pill being taken the same time every day. You also have to assume she's not on antibiotics or any other drugs that can mess with their effectiveness.
The only safe thing to do is wrap it up. You just can't trust something that important to someone else's judgement.