What happened after Ona went back to work?

Answer: She was never well again

Explanation:

Ona Rudkus is a character of the book ''The Jungle'' by American novelist and journalist Upton Sinclair Jr. It is published in 1905 year and it is describing lives of immigrants that was very hard for them in the US and other cities.

When Ona got back to her work she found out that she is having ''womb trouble'' and because of that she was never feeling well and healthy again.

It is a sad but true story spoken trough fiction.