What I can find from Chinese sources all seem to have been derived from the one source, which seems reasonably reliable. It says that:
She married Mao when he was 14 and she 18.
She died of dysentry some time in the spring of 1910, when she was 20.
She had a good relationship with the Mao family. Mao Zedong, after some initial awkardness owing to his youth, also grew to have a good relationship with her. He also had a good relationship with her family. In the years following her death until as late as 1959, he visited her family several times.