Stop giving the babies treats. The chick starter is all that they need and should be getting for quite some time. The feed should be wet for a while to make it easier and more tempting to eat. Even my adult birds prefer wet feed to dry. The more you keep handling her and cuddling her, the more you are making her dependent on you. If what you are aiming for is a chicken in a diaper living in your house and following you around all day being waited on, that is what you will get. You need to make her learn to be a chicken and to stay with other chickens. You can try the feather duster trick. I did but my chicks have always pretty much ignored it. Forcing water into her may be doing more harm than good. Putting water to her bill gives her no choice but to drink it. Put the water in a shallow tray and float a couple of shavings on top. The movement of the shavings on the water will encourage pecking at the water surface.