I'm working on my novel and I was wondering if nicknames are alright to use when a character isn't speaking. EX: “Sam was having a really intense vision and I was stupid enough to scare her out of it,” Morgan replied sheepishly. Sam didn’t see this as an excuse in any way, shape or form. “Are you sure you’re alright?” she said in a choked voice. In the second paragraph- is using "Sam" alright or do I need to switch it to her full name (Samantha)?