That all sounds very normal. She needs to be trained not to bark. Poop eating isn't going to kill her. She can be trained to walk properly. And she should not be let around your other dog without supervision if there are issues there. Sounds like this pup has way too much freedom. Crate or xpen when you can't watch her. Separate the dogs. No need to put any stress on the older dog when you aren't home to watch. If play gets too rough for the older one when you are home, the pup can be separated. When my pup really starts aggravating my older dog (or me for that matter), he gets crated. I just won't chase a wild pup for hours and I don't expect my older dog to constantly handle it. When it goes beyond play and she is frustrated, they are separated.
You can use a product for the poop eating. Worth a try. How about a water bottle for the barking?
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