There are many reasons why dogs develop aggression issues.
Have you taken her to the vet recently? Some illnesses or other medical problems could be the cause. If a dog is in pain it could cause aggression. In my experience, one of my Pit Bulls was the sweetest dog ever but sometimes, he would randomly turn. Most of the time it happened when he was in his kennel but there were several times he went through it outside of it. With the help of our vet, we were able to narrow it down to two things. Either a chemical imbalance in his brain that was causing him confusion amongst other things or a brain tumor that was pressing on a nerve and making him act out. I used to volunteer at my local animal shelter and they once had a family surrender their Boxer because he would randomly turn on them. He had attacked one of the kids and his family gave up on him. The shelter's vet had determined after some tests that he had a brain tumor that was pressing on one or more of his nerves in his brain and it was causing him to act aggressively.
Some other possible reasons for aggression are frustration, fear, possessiveness, or a show of dominance. From the information you have provided, it doesn't sound like she's fearful or possessive of anything. I clearly don't know about your personal life and living arrangements but some common causes of frustration in dogs are; spending too much time in a cage or tied up. They can also become frustrated if they're picked up or touched constantly which by you saying your kids respect animals and are gentle with them, I'll say that's not the case either. The show of dominance I don't have experience in so I can't really say anything about that but a quick google search should provide some insight!
Have you taken her to the vet recently? Some illnesses or other medical problems could be the cause. If a dog is in pain it could cause aggression. In my experience, one of my Pit Bulls was the sweetest dog ever but sometimes, he would randomly turn. Most of the time it happened when he was in his kennel but there were several times he went through it outside of it. With the help of our vet, we were able to narrow it down to two things. Either a chemical imbalance in his brain that was causing him confusion amongst other things or a brain tumor that was pressing on a nerve and making him act out. I used to volunteer at my local animal shelter and they once had a family surrender their Boxer because he would randomly turn on them. He had attacked one of the kids and his family gave up on him. The shelter's vet had determined after some tests that he had a brain tumor that was pressing on one or more of his nerves in his brain and it was causing him to act aggressively.
Some other possible reasons for aggression are frustration, fear, possessiveness, or a show of dominance. From the information you have provided, it doesn't sound like she's fearful or possessive of anything. I clearly don't know about your personal life and living arrangements but some common causes of frustration in dogs are; spending too much time in a cage or tied up. They can also become frustrated if they're picked up or touched constantly which by you saying your kids respect animals and are gentle with them, I'll say that's not the case either. The show of dominance I don't have experience in so I can't really say anything about that but a quick google search should provide some insight!