please help me with this sentence

Good day!
I came across to this forum while I was doing my self study regarding my daughter's school lessons. She's a grade 5 student. By the way, I saw her writing this sentence ...' I feel most happiness when people satisfy by my kindness'...that sentence is somehow incorrect for me to analyze so, I told my daughter and was asked me back why.... I told her it should be ' I feel the happiest when people are satisfied of my kindness'....because it should be superlative of adjective 'the happiest' instead of the noun 'happiness'...and also, it should be 'of' instead of 'by' (dunno the grammar terms for those. Finally, she should use be verb 'are' prior to the word 'people'...are my corrections and instructions to her are correct? Please guide me. thanks