CIO is Not My Thing

Took my 6 monther to the doc yesterday for her shots and he, again, told me to stop feeding her at 7 and don't feed her or do anything else with her until 7 the next morning no matter how much she cries. He said after a couple days of this she should be fine but I just can't. Are there any other more gentler methods of getting a baby through the night? She's been doing a lot better since her 3 month checkup. We've gone from feeding every hour through the night to every 2 to 4 hours. I'm just tired of people rushing her to do certain things when I feel she's not ready yet and just picking up on her cues. I read about watering down her milk more and more each night until its just water where she won't want it. Anyone have luck with that? Thanks y'all!