I'm going to make my mom wait 45 minutes for me after school
Why is she going to wait on you?
I hate my mum so much!
Whether you like your mom or not it seems kind of petty to make her wait for this long. You might as well have her get there at the right time unless you want her to be upset with you. This is definitely not going to help your guys relationship with one another.
Fine mom will take me to the late show. I'll buy her some flowers.
That might be the first step in fixing the relationship, but it is going to take more work than that. You could start by not making her wait for you for that long.