Hi. I don't want you to feel ignored.
Can you give us a history of her early years (a funny question for a five year old). Did she have a normal infancy? Did she lose any primary caregivers early on or was she exposed to lots of chaos? Is she adopted? Does she do dangerous things to her siblings and to animals? If so, I would seriously rehome the dogs...they aren't safe. What worries you so much? We can help more if we know more. Does she have any delays? Speech issues? Obsessions, such as mimicking cartoons she has watched and memorizing them verbatim? Does she like watching the same things over and over again? Does she know how to play with toys? Silly question again, but autistic kids often either ignore toys of don't play with them right...they take them apart...they lack an imagitnation of the normal sort...They can also often seem as if they are in their own world and then, at other times, seem completely with it and normal. Often they rock back and forth or kind of flap their arms or make odd throat noises or smack their lips.
I raised a son successfully who is on the autism spectrum. He is 21 and doing great, but he got a ton of help isn't 100% like a typical twenty one year old. He was never mean. In fact, people seem to love him. But he was a handful before he got the appropriate interventions, however. Any psychiatric problems or autism in your family tree or his fathers? These things can be hereditary. Sorry for the inquisition...
My first bit of advice is to take her to a neuropsychologist for a complete evaluation. They are really the prime of the diagnosticians. We are here to help