Answer:
Incendiary means "inflammatory" in this text.
Step-by-step explanation:
This short text is from "Afro-asian Voices" by Melchora D. Bilgera.
The text's simplification and explanation might be like,
Whenever Mademoiselle would ask something from Diouana, she only got an inflammatory/provocative response from Diouana. Mademoiselle complained about her behavior to Monsieur. And he asked from Diouana what the matter was with her, whether she was ill or something else.