No ones perfect. As children we grow up trusting and copying our parents, but as we mature we may find lots of loopholes in our parents principles, the best thing we can do is to first forgive them for their wrong.
I learned forgiving people a hard way, it wasn't easy and almost impossible for me, but by the grace of God and because of the prayer's of the saints I learned to forgive and now I know the importance of forgiveness.
One great thing I learned about forgiveness is, that if we don't forgive people; somewhere in future we may end up in the same condemnation we gave them .
We learn this in Matthew 18:23-35
23 “Therefore, the kingdom of heaven is like a king who wanted to settle accounts with his servants. 24 As he began the settlement, a man who owed him ten thousand bags of gold[a] was brought to him. 25 Since he was not able to pay, the master ordered that he and his wife and his children and all that he had be sold to repay the debt.
26 “At this the servant fell on his knees before him. ‘Be patient with me,’ he begged, ‘and I will pay back everything.’ 27 The servant’s master took pity on him, canceled the debt and let him go.
28 “But when that servant went out, he found one of his fellow servants who owed him a hundred silver coins. He grabbed him and began to choke him. ‘Pay back what you owe me!’ he demanded.
29 “His fellow servant fell to his knees and begged him, ‘Be patient with me, and I will pay it back.’
30 “But he refused. Instead, he went off and had the man thrown into prison until he could pay the debt. 31 When the other servants saw what had happened, they were outraged and went and told their master everything that had happened.
32 “Then the master called the servant in. ‘You wicked servant,’ he said, ‘I canceled all that debt of yours because you begged me to.
33 Shouldn't you have had mercy on your fellow servant just as I had on you?’ 34 In anger his master handed him over to the jailers to be tortured, until he should pay back all he owed.
35 “This is how my heavenly Father will treat each of you unless you forgive your brother or sister from your heart.”
Pray to God for your mom, might be when she notices your good behavior and love for her she may change, if not you can be at least relieved that you gave a try.
God will surely bless you for being a nice daughter and perhaps He may grant you added blessing to be a better mom in future.
God bless you.