That show had a long run, about 11 or 12 years, so there were bound to be cast changes along the way. I watched maybe half a dozen episodes from either the second or third season, but I remember the character Lorna is talking about; Barbara, you must have watched episodes from later in the run.
The girl's name was Summer, and her mother had a restaurant on the beach which she named after her daughter (The Summer Place). I remember an episode in which Summer woke up in the bed of a male lifeguard with whom she'd spent the night, and she was as dewey and fresh and innocent as the day she was hatched. A very good example of a renewable virgin.