This was a low-budget adaptation of a John Gardner novel.
Henry Soames owns a rural diner, and has befriended Willard Freud and Callie Wells. One day Willard and Callie get the news that Callie is pregnant, and Willard leaves her. Henry takes in Callie, and helps her through the pregnancy. They fall in love and get married. All is going well until Willard is back from the road and wants the baby.
I learned today that Iceland claims this film! Here is the entry from the Icelandic Film Centre.
If you want to see any nudity from Heather, this is about your only choice. (She had a very brief bit of areola exposure in the full-screen version of Nightmare on Elm Street, but the underwater nudity was done by a body double.)
Heather turns 60 this month, and hasn’t been naked on screen in 40 years, so I don’t think we can expect any additions to her nudography.