I want to get married with or without my mom's approval.
How will you get married without her approval?
I'm thinking of doing it secretly.
You should get together with her and talk about this. They might feel better about the marriage after talking with you about it.
I will talk to her soon, she is busy right now.
It's good you are going to talk to her. Your mother just wants what is best, so be prepared to explain how marriage is good for you.