Your mother, who logs into your account has a habit of jumping the gun into situations without knowing anything about people.
This is her first problem. And this problem isn't unique because it happens to many people, my mother included who is in a better position to say something wise about a situation relating to her brothers and sisters in real life but instead chooses something completely off.
In the Internet, where you don't know anything about people this situation is even more obvious.
For example, i know Demi longer than you here and i know that she is tougher than steel with whatever life has thrown at her and she has the grace to forgive a lot of nonsensical stuff like she did when she responded to the intrusive comments of your mother.
I know it's difficult to understand how family dynamics are outside of what you've learned on your zip code, but since respecting the boundaries is now the theme of this song, start by respecting people's boundaries first, try to be non-judgmental, don't assume things, ask more questions and then attempt to give an answer.
Don't be controlling, don't be nosy, respect free-will and don't be manipulative for different reasons.
These are some good starting points to have a good-faith discussion.
"Don't be controlling, don't be nosy, respect free-will and don't be manipulative for different reasons.
These are some good starting points to have a good-faith discussion."
LOL