I have no idea what you mean by her 6B having three auto attacks, but she has a lot of different versions of her B moves so maybe thats what you mean. She has 4B, 5B, and 6B which control the momentum of her 5B. You can also do things like 6B or 4B to get varying distances on it. You can get a charged version of her B attacks by holding it down, and you can release whenever.
Also, her if you release her 2[B] 1 frame before being fully charged, she gets a just frame version that does 1k damage. Same with j.[B] but I think that version does 900 damage.