How does Mama react to the bear invading their home? What does she think it means

Lyddie immediately takes charge remaining calm. She tells her mother and siblings not to yell because it might scare the bear.

"Just back up slow and quiet to the ladder and climb up to the loft. Charlie, you get Agnes, and Mama, you take Rachel." She heard her mother whimper. "Shhh," she continued, her voice absolutely even. "It's all right long as nobody gets upset. Just take it nice and gentle, ey? I'm watching him all the way, and I'll yank the ladder up after me." (Ch. 1)

Mother lets Lyddie take the lead until the danger is over.