Hi there! A year and a half ago I fostered a cat by the name of Amelia. I fell in love with Amelia but I couldn't keep her so the original owner found a new home following me. The new home that Amelia went to ended up not working out so I was called upon to take her since I'm in a position where I can now. However, I have another cat now; Lisbeth. The two have been separated since the day I brought Amelia home--which was 3 days ago. Amelia is in the guest bedroom with her own litter box, food and water. She has not met Lisbeth face to face yet but they are aware of each other and Amelia has been hissing and growling quite a bit! She has even swatted at me. I'm guessing this is because she can smell Lisbeth. Fortunately, Lisbeth is not doing any hissing and growling and it is only Amelia. Amelia is very aggressive and I'm trying not to be too worried. How much time do I give them? What are some things I can be doing in the meantime to make this less hellish?
Also, do cats remember people from their past? Amelia last saw me a year and a half ago. Thanks for any and all advice/input!