Hello, Margaret. It makes some sense, but the verb tenses seem strange. I would also rather see a verb other than "find" in this remark. Here is something I might use to express the same idea: She thought her marriage was a happy one.
Thank you! May I know if this sentence makes sense with the verb "realized", like this: She realized her marriage was a happy one.
The context is "She always thought only a marriage with money is happy. However, when she experienced something, she realized/thought her marriage is very happy."