Let's get a couple of things right. Gramma Caroline & Kayla are watching Ciara, and probably Joey. Marlena has Arianna (Will talked to her on the phone to check on Arianna). No idea about Johnny & Sydney, except maybe Harold & Mary are watching them.
Nick does not necessarily have to have a funeral in Salem. His body could be sent to where his mother is. Maybe he will be cremated, and his ashes sent/brought to her. Julie said to Gabi about going to see Nick, that it would be their last chance to see him.
And yes, in my opinion, Julie did go overboard. People came forward to help, and she told them all to stay away, get back.And they came to the hospital out of concern, and she berated them all again.
As to Will & Sonny. No idea why Will would even begin to suspect Sonny, as after they put the gun up on the shelf TOGETHER, they left TOGETHER, and were TOGETHER continually afterwards.