For most of the cases, writers put rhyming lines at the end of their writing to create some sort of easier flow for the readers.
This will make the end-rhymed lines will become catchy and easier to remember for the readers
hope this helps
Her mother is her final opponent because her mother had so much more power over her and she wanted to break free. Also because she imagined her mother to be her final.
Chugged is the main word that should give it away. It is kind of exaggerating the car going up the mountain. I assume it would be a hyperbole.
Hope I helped!
