No, I really never had a clue of her unhappiness; there were likely clues and I just missed them.
The W is extremely passive and non-confrontational so her typical reaction to anger or disagreemnt has been to let it go and not stand up for herself. As a result (after 9 years), a resentment monster has been created.
When she did/does reach the boiling point however, she could/can rip into soemone with the best of them, a skill she learned from her mother.