I thought I saw Khrystyne Haje in a few episodes but wasn't sure.

According to this https://www.imdb.com/name/nm0354467/ she played "Teenage Chrissy Seaver" in the "Future Shock" episode from 1990.

Yes, the only episode that Khrystyne guest-starred on was "Future Shock" from Feb. 1990, where she played a teenage version of Chrissy Seaver in a dream that Maggie had. I saw that Antenna TV did air that episode last summer.