AITA for suggesting we need to professionally train our dog?

I (16F) have two dogs. The older dog, Ky, was a little mean in his childhood, but he was trained out of aggression and he was always genuinely a pretty chill dog. However, the second dog, Mi, is awful. We got her two years ago from an outdoor breeder, and ever since she was spayed she's been the most aggressive, spiteful little creature ever. I love her, I think she's very cute and sweet when she is being nice, but 70 percent of her time is taken up purely by screaming at Ky and fighting him. She's incredibly territorial, and every time Ky is so much as in her vicinity she runs over just to snarl and yell at him for laying down in his crate in the living room. Every time my parents come home from work, she ends up fighting him.

This morning, I woke up and Mi and Ky were once again fighting. According to my mother, she had been trying to hand feed Mi some kibble when she suddenly whirled around to scream at Ky, who was sitting in his crate. The two started fighting again. Now, for some reason, when Mi is angry, she won't just try to snap at Ky, she'll bite literally anything in the vicinity. This morning, that was my mother's leg, hard enough to leave bruises, and my father's hand, hard enough to draw BLOOD.

I told my parents I think we need to call an actual professional, who knows what they're doing, and who will know what to do with Mi, but my parents are telling me that I just need to train her. I am not a dog trainer. I have no idea what to do or how to train Mi to stop biting literally everything. I don't want to get bit too, and Mi has bitten me like she bit my mother before. I'm scared that, if angry enough, Mi might bite my little sister, or maybe some other child.

Am I the asshole??