Please separate them 100% of them time...starting now. The first thing you want to do is take the new kitty to the vet and have her checked out. You don't want her passing any diseases to your existing cat, especially since she is elderly.
Then you will need to do a very slow introduction, I don't have time to write out the details right now...you can google "cat introduction" and get lots of info though.
Chances are, due to the age of your existing kitty this may take quite a while, especially if she's always been an only cat. The pregnancy of the new kitty won't help either. So be prepared for this is be a very slow intro process...many weeks, possibly months. Good luck...
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...