Advice needs: kitten adoption and resident cat not happy

I have an 8 year old resident cat who is a rescue and now adopted a 16 week old kitten. We have had the kitten 8 weeks now, have completed scent swopping, seperate rooms and I have a mesh gate to seperate them. The resident cat is still very stressed by this new additon, she has urinary frequency and is hissing at the kitten everytime she sees her. I can’t get both cats to eat with each other and my resident cat never asks for food so would not work. How long does it take for both cats to at least tolerate each other? Is there anything else I can do? Thanks In advance

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scooogy · 31-35, MVIP

My foster dog's owner had given his two dogs into foster care by friends of his for at least half a year each time he planned to travel somewhere for longer. Once it was for a whole year and while the one dog first barked at his actual owner before getting to sniff his scent and remember him, the two dogs had had quite some issues with getting along with each other again after a whole year of separation.

Their owner decided to try and fixate them each to one side of him sitting on a chair. They would both look at each other and of course initially bark at each other a lot. But step by step the owner conditioned both of them to stop barking at each other by giving treats, which led them to growing together again.

I don't know whether cats might be more complicated here nor if the two dogs remembered what they got along well at. For example your resident cat might accept eating together with the kitten, but not sleeping in the same room. Or sharing toys or whatever. But if you try and maybe succeed in conditioning to at least tolerate each other doing one of these many things, you could try and repeat this for whatever doesn't work by then.