There are a few reasons why your dog might dig when she's excited. One reason could be that she's trying to bury something. When dogs get excited, they sometimes try to bury their toys or treats. This is called excavation behavior. Another reason could be that she's trying to create a cool place to lie down. When dogs get hot, they sometimes dig in the dirt to create a cool spot to lie down in. Finally, your dog might be trying to get your attention. Dogs are very social creatures, and they often dig when they want your attention. If you think your dog is digging for attention, try giving her some extra attention when she's calm and see if that stops the digging behavior.