Can I improve my cat’s behaviour?

[Valentinesschmalentines]

Kitty is 5 year old female. Super feisty and has mad spells of running around like a loon, hiding and pouncing. She’s quick to use claws and jaws, and when she’s aggressive she does not back off but comes after me/others even if they retreat! We don’t mistreat her, situations get bad simply because we move her from where she’s sitting or she’s sitting on a lap and person with said lap needs to get up.
Life has changed with a new baby (now 11 months), and I appreciate it must be frustrating for her that she gets less attention and peace than before, but she’s a vicious blur of paws, jaws and claws on an almost daily basis. Is there any way to improve this?

[thecatneuterer]

Does she have a cat flap?

[UtterlyUnimaginativeUsername]

Is it aggression or playfulness?

[Valentinesschmalentines]

She doesn’t have a cat flap but is welcome to go outside whenever she likes. She’s not keen, especially if the weather isn’t ideal.

Sometimes it is playful but the times I’m concerned about are definitely not. She “turns” and becomes angry.

[Fluffycloudland77]

Is she tortoiseshell?

[Valentinesschmalentines]

Sort of brown tabby and white

[Fluffycloudland77]

She looks what my mum would have called calico, tortoiseshell & white.

Torties can be a bit mad.