Your mom is a cheater... and I know this because MY mom is a cheater.
She used to let me grab her phone and do whatever with it whenever and then one year wouldn't let the effing thing out of her sight.
She was always "shopping" for hours way into the night and only coming home with one bag or nothing at all.
Even claimed to be at the mall hours after it had closed. Well I got her to admit it eventually and my dad found out on his own before either of us told him!
Now she is cheating on her boyfriend (the guy she cheated on my dad with) and I'm so sick of it she lies to me about it. So gross.