She is motivated by sight and something that doesnt move and is no challenge will not be of any interest to her now. It may of been when she was younger but now she has experienced the actual chase why should she be bothered about something that is dead and no challenge to her. I would advise that you take her out on her own so she can have the chase and the kill, if you keep taking her out in a pack if she doesnt manage to get a kill she may decide not to bother chasing aswell. Hope this makes sense to you