You shouldn't stick your nose into someone else's business.
Lucy was in the waiting room as Jessie while Jessie was on the phone.
Lucy wants to sit down.
Lucy sits across the room from Jessie, so she can carry on her conversation in private.
Lucy sits right by Jessie and interjects comments as Jessie tries to have a conversation.
Jessie thanks Lucy for her consideration after she finishes with her conversation.
Jessie eventually moves away and tells Lucy she needs to mind her own business.