Okay, I may be totally out to lunch on this but....
I think Nikki's got a kid she's given up for adoption or something along those lines and Kay wants her to get in touch with this long lost child. Hence the shot of her staring at the phone.
I say Sharon should have a complete meltdown and be admitted to the psych hospital. It's the only way to save her from herself at this point. I'm mean, she's seeing dead people. That in itself is looney. Although Jack keeps seeing his dad too...

