The thing to do next is wait patiently.

Your cat is displaying some re-directed aggression. She is upset about the newcomer and is taking it out on you. When she gets hissy, just get out of her way.

Do invest in a Comfort Zone plug-in with Feliway. They are pricy, but I think your cat may need to be exposed to the calming phemones it produces.

You should try crating your first cat and letting the kitten roam around "her" space for a week or so.

Don't rush things. Sometimes a cat introduction can take a month or so even before they are exposed to each other. Take your time.

If your cat is still hissing at you, or becomes dangerously aggressive, consult your vet for some meds which may help ease the situation and also for an animal behaviorist who may be able to help!

Best wishes!
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Smile, it will make them wonder what you are up to!

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