I am not sure what the "would" in the following quote mean.
(after a lioness was shot)
At any rate she [=a lioness] got to the bush in safety, and once there, began to make such a diabolical noise as I never heard before. She would whine and shriek with pain, and then burst out into perfect volleys of roaring that shook the whole place.Henry Rider Haggard, A Tale of Three Lions
What is the difference between "she would whine and shriek" and "she whined and shrieked" here? I appreciate your help very much.