Yes paranoia can be a symptom. "Feelings" can be from flashbacks and memories, but there may be more too this also. Now is where you have to listen. Look for patterns or trends. Now when she is calm bring it up gently that you have noticed that she has feelings. Ask her to explain. Do not challenge her about this. Peace and quiet allows the brain to think. When someone is troubled by past then it can be a time for memories. So they can go from calm to something is wrong very quickly.