That is a hard qustion, but have you seen any other signs other than that? I remember when I was young (about 6) I had a cocker spaniel and it was the same way. she was my side kick and my protector. I can actually remember one time she was sleeping and I snuggled up behind her on the floor. The same thing happened. She growled and snapped at me. But then when she saw it was me she seemed remorseful. I remember it hurt my feelings so bad as a kid. (I guess so if I still can remember it 20 years later). But my whole point is that your dog was sound asleep and all of the sudden someone jumped on her, even if it was her girl, she didn't know it and dogs have instincts. My cocker spaniel was still my side kick after that, I just knew to not startle her when she was sleeping. Think how when you first wake up how groggy you are, I am anyway, so I would be surprised too. Now I am in no way saying the behavior should be tolerated should it keep up, but to me it sounds like an accident. Now this is your child and I understand how this is a hard thing because you would under no circumstances forgive yourself if the dog did something and you should have gotten rid of her, so that is why you need to use your gut instinct. You know the dog's behavior normally better than any of us. Has she been normal since that with your daughter? I would make sure they have supervised playing time together and first signs of any growling, biting, etc. get rid of the dog. Your child comes first and I comlpetely understand that. I still think it was probably just her being asleep and being startled, because it sounds like she loves your daughter very much. Maybe some other people here have some more advice for you, they are always so helpful. I hope it all goes well for you and everything works out ok. Please keep us updated.