Thank you for the ideas I will try them out. Have a great day!
Kittens are fairly easy to introduce. I would keep the kitten in a separate room for 1-2 days until she doesn't smell "foreign". Then bring her into the room with your cat. Keep an eye on them, but don't be surprised if it gets a little physical. It's not hard for an adult cat to establish dominance with a kitten, they expect it.
I'm sorry to hear of the loss of Sunshine, by the way.