if the parents are rocking her to sleep then this is going to take a long time. if you are letting her cry it out I wouldn't go back in at all till nap time is over. you could be just escalating her in the sense when you come in she is getting false hope that you are going to pick her up and when you don't she goes back to shrieking. I would let the parents know that the longer they keep rocking her the harder it is on her to adjust. I let me parents know at interview time that I don't rock and that children must be able to go to bed awake and fall asleep on their own. I don't have a problem with the sippy cup unless they are expecting you to hold her and feed it to her ....no no no it goes on the high chair tray and they pick it up themselves and drink it. ......does she eat any finger foods? if not then I would tell the parents she needs to start casue you don't have time to feed her every meal. the rocking thing would be the deal breaker for me ...as long as a kid sleeps I can manage the rest.