You have to realize that dogs don't come one way and are like that forever..they need constant training. She may have been calm/less dominate in the beginning but she's now learned what she can and can't get away with. I know that she's only your second dog (right?) so I would HIGHLY suggest taking some obedience classes. Not only will it help her but it'll help you learn how to be a pack leader.
Eating poop is very easily taken care of..pick it up as soon as she goes...or prevent her from doing it. There are also a product out there that you can buy (can't think of the name right now) but you put it in her food so she'll be less likely to eat the excrement.
As for the food, I take it your free feeding her? What I would do is give her a small portion in the morning, set it down, wait 5-10 minutes and pick it back up. Do the same thing at night. A normal dog will not starve itself, she will quickly learn the routine and eat when the food is put down.
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