are you using a bait that she can't resist, or does she have a special toy that makes her perk up? A squeaker perhaps? I take a little tennis ball into the ring for Yogi. I just pull it out of my pocket "Is THIS what you WANT?!" and up his tail goes. Are you being exclamatory in your talking with her "WHAT a GOOD GIRL!!!!" "Do you Want this TREAT!?" constant peppy talk can help as you tease them with the bait or toy. You have to make it fun for her. If you take it too seriously or act serious they get those vibes.