The likelyhood of success in induction is based a lot on how soft and thinned the cervix is, and if baby is in a good position and low. If the cervix isn't very ready yet maybe with cervidil inserted it could be made ready medically, improving the odds. If she is given pitocin, or cervidil or cytotec it might actually cause placental problems though, uterine over stimulation or contractions that aren't well co-ordinated might make a placenta detach during labor. Also if they aren't sure how ok the baby is due to the drugs and drinking early on I'd worry about causing fetal distress with unnatural contractions too. If she tries an induction but the waters aren't broken and no complications arise, it just doesn't make progress happen, she could give it up and go home to await normal labor.