Cat HATES other people (aggressive)

My partner and I have a cat who will be a year old in April. A friend found her in a warehouse at work when she was about 10 days old and we had to bottle feed her. She sucks on my shirt at night which I know is common for bottle fed cats but not on my boyfriend (maybe thinks I'm her mom?) anyways, she was friendly as a younger cat but now she hates anyone who is not me or my boyfriend. Our friends don't believe us that she's the biggest sweetheart anymore. With us she lets us hold her and she snuggles all the time. I'm not sure if started happening after she was spayed or when we got our dog (they like each other) but now she'll hiss and bite anyone else who tries to touch her and even attacked our friend out of the blue. We moved her food and litter box to a separate part of the house away from where guests mingle and also put a pheromone diffuser in the living room. She has only lived in our house since we got her. Is she being territorial? Help!

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