What parts of Mrs. Stevenson personality might have been misunderstood or allow her to be misunderstood by others? Sorry wrong number

Mrs. Stevenson's described by author as a querulous and self-centered woman. Her personality's been misunderstood by others as she complaints about over-hearing a wrong call-plotting a murder of a woman, because she is an invalid woman.

Explanation:

'Sorry, Wrong Number' is a play written by Lucille Fletcher. The play was written as a radio drama, with the intent to be heard rather than seen.

Mrs. Stevenson is an invalid woman, confined to her bed due to an unknown illness. She is been shown, althrough the play laying on her bed and trying to connect with her husband over a telephone.

Mrs. Stevenson is described by the author as a querulous and self-centered woman. But the personality trait that might have allowed her to be misunderstood by others is her invalidity. Mrs. Stevenson gets agitated easily when no one pays attention to what she is saying and starts nagging about it. She continues to complaint about hearing a phone call, planning of a murder of a woman. Other characters in the play must have misunderstood her due to, first, her invalidity- trying not to take too seriously a complaint from an invalid woman- bedridden for twelve years. Another trait must have been her nagging and complaining attitude.

wheres the passage with the idiom underlined