Her Own Rules (1998)

Melissa Gilbert stars as Meredith. A sad and lonely writer returning to her home town in England for the first time since she was about 6 or 7 years old, after being adopted and raised in America. While there she decides to look for her mother's grave, and finds out her memories are not exactly what she thought they were, her mother is alive. She then sets out to find her mother and some answers and finds both. She also falls in love, of course, but has a problem with long term commitments...