Haha! Thanks for the comments! Yes, she did have some apple but that bite wasn't her :)
Yesterday, she yelped when we were doing our trick routine. After examining her hips and legs, I realized she had an abscess between her paw. Poor girl, it has already popped and there was some blood. She wasn't licking her paw before this so I didn't suspect anything at all.
Manage to clean and apply some antiseptic cream while she was distracted chewing a fresh new nylon bone. She's better now.