Hi,
How is she with your kitty?Or is your cat kept indoors? We fostered a dane like this once and we ended up having to give him back because he really hurt one of the cats and we couldn't leave him outdoors... I suggest a behaviorist as well, but if your like me none around the area maybe fence her in somehow ummm like a bell on her collar would let cats be weary of her in case she snuck up I dunno what to tell you... Has she ever tried to hurt Tiny cause that lil ones really Tiny maybe its all small animals... I'm sorry....