Commentary for I Kings 1:28

then King David answered and said, "Call me Bath-sheba": It would appear from this that Bath-sheba left the room when Nathan the prophet came to speak to the king in order that the king would not recognize that this was an agreed upon matter between them. Thus David called for Bath-sheba and was afraid to come to her to say these words, because she was more self-confident than Nathan the prophet, as we found with what the Tekoaite woman did, that she said these words to Joab, not to her. (2 Samuel 14:2)