Opinion(s) on something I've been thinking?

Alright, short and sweet to the point. Someone says they wouldn’t dare to disrespect their mother. Now, 2 questions -

1. Is lying a way of disrespect?
2. If a person that says they wouldn’t disrespect their mother, lies to her either way, is this person capable of lying to you?

Okay for example -

Jane says she would never disrespect her mother. Yet, she lies to her mother about something. Now does this mean Jane is capable of and will lie to ANYONE? (whether it’s to cover something/someone, or lie about where she’s going, what she’s doing, etc..)

If you need me to re-phrase this, ask and I will try my best to do so.