I’m sorry to hear about your mother. What you’re going through with your mother is something most of us have experienced during various times in our lives in Christ. Often people who’ve had negative experiences with Christianity take it out on the people they know who are most obviously Christian, and, sometimes, they do it in an attempt to “discredit” Cristianity - Thinking that if they can get us to retaliate to their sniping and rude behavior, it must mean that Christianity isn’t as life-changing as we say it is.
It’s her problem - Not yours, and I’m sorry you have to experience it. Christ means to make us all into saints, but that process is one that takes a lifetime of hard work, and many of us will need Purgatory to complete the process.
Prayer is a conversation. If what you need to do is to pray the Chaplet of Divne Mercy, by all means, do so. But, please don’t consider the Apostle’s Creed to be a Burden. It isn’t just “What you believe.” It’s a short meditation on who God is and What Christ did and how the World will end. It’s also called a “Prayer of Belief”. In the Early Church, the Believers couldn’t enter the Presence of God and do the Mass of the Faithful unless they all together had said this. and, Catechumens weren’t allowed to say it until their baptism - They were even sent out of Church BEFORE the Creed was said.
We are talking to God in the Creed, and He is talking to us, reminding us who He is, and what He did and will do for us:
*I believe in God, the Father almighty, creator of heaven and earth.
I believe in Jesus Christ, God’s only Son, our Lord, who was conceived by the Holy Spirit, born of the Virgin Mary, suffered under Pontius Pilate,
was crucified, died, and was buried; he descended to the dead. On the third day he rose again; he ascended into heaven, he is seated at the right hand of the Father, and he will come again to judge the living and the dead.
I believe in the Holy Spirit, the holy Catholic Church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting.*
But the Creed isn’t just “What you believe” and something to get through or dispense away with - It reminds us Who we are talking to.
Your Brother in Christ, Michael