You and your mom are smart to know when to walk away from betting on certain games when it's going as planned.Growing up I always remember my mum putting bets on certain sports events but she would only ever do it for certain events and she was very careful when she did bet and would not bet more than once even if she won.
My mum always used to go by tips and even though sometimes she was successful and had a win, other times she took a loss but walked away.
I myself have done some betting in the past on football such as the World Cup and I tend to rely on tips, I have had a few small wins but much like my mum, I walk away and don't keep going back.
The reason why both of you were able to do this is because you're not addicted to the betting. If you do, waking away will be very hard. You will have this urge to play one more time and you're going to win.