Has Olivia been checked by a vet? I would keep her and JoJo apart until she's been checked out and then I would give them a few days to get adjusted to the smell of each other under the door before letting them see each other. One thing that might help would be to give each kitty a towel or blanket to sleep on and then once they've gotten their scent on it swap the blankets and let them "smell" each other. That helped with my guys.
If Fenway hasn't really been around a little kitten you may want to be very cautious with him. Kittens bounce around differently from cats and it might kick in his prey drive. Has he gone after a ferret before? This little kitten might definitely look the same to him. You might want to keep him on a leash when you introduce them so you have control of him just in case.
How old is the kitten? She sounds like she may have been taken from her mom too soon if she is crying that much.
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