The dancer in the Hang On Sloopy Video is Lisa Leonard Dalton.
Liz Brewer was never married to Rick Derringer. Liz Agriss married Rick Derringer but was not the dancer in the video. Rick did not know the dancer.
The video was made for the 1975 remake of Hang On Sloopy by Rick Derringer as a solo artist.
The most popular version of the song was in 1965 by The McCoys with Rick Derringer lead singer.
More info on Sloopy Girl Lisa Leonard Dalton:
https://www.youtube.com/watch?v=wQvNxN1lSdw
https://www.youtube.com/channel/UClRn3E43flevhReqr7WAApg
https://pugetsound.media/2021/10/03/sloopy-wives-fact-and-fiction/