shehas been so un-loved for so long. she wants you for herself, like a child you have to teach them. scold her when she does that. have one dog next to you on one side and the other on the other side. slowly do this process and when she acts up scold her. play rope, or ball with them together. They will learn how to play. she just has to get adjusted to you the older dog and someone to love her. best of luck, if this does not help look up the dog wisperer on line, he is really good with animals or go to pet co they do training there. They can work with them together or seperate.
best of luck