If she never mentioned a single issue with her marriage throughout her life and was most happily married then I don't see what's the problem with you.
She might have been happy with her married life. But that doesn't mean that it is legal to marry off kids at the age of 9. Until a girl is 18 years of age, and thereby attaining legal majority, she should not be allowed to marry. Whether she wishes to marry before that age or not is irrelevant here.
Islam obligates it followers to obey law. But why do westerners fuck like animals before 18? I understand that fornication is considered normal in west but it's worst than marrying earlier as there is risk of unwanted pregnancy which follows abortions or illegitimate children.
But it's hard to explain such ethics to westerners.