My 14 week old becomes a gremlin

[Lisa Mossy]

My first Australian Labradoodle so I am a newbie. Izzy has a switch that she turns on - any time day or night (usually at night) whereby she instantly turns aggressive, crazy wild running around, biting badly, jumping up to tear clothes - she is so fast we cannot catch her but when we do she instantly goes into her gated "octagon". (Time out area) There is no way to calm her except by doing this. Is this normal???

A little background - just my husband and myself in the home (other than a housekeeper) - just Izzy and myself during the day. I provide her with chew toys, toys, trips outside as often as she wants. HOW could she be overstimulated?

[Tammy and Violet]

Is she excited when she starts her craziness ? Violet was either by the cats or looks outside and sees someone or dogs