Leslie?
Is that she on the cover of the first season DVD? It doesn't look like her at all.
http://www.tvshowsondvd.com/graphics/news3/Newhart_S1.jpg
Hmmmmm...........you pose an interesting question.
Jennifer Holmes has a (somewhat) similar hairstyle in the black & white image at the top of this page:
http://zebradelic.blogspot.com/2011/08/actress-jennifer-holmes.html
However, you're right about the fact that that just does not look like her face on the dvd cover at all.
Who knows........maybe it is, and somebody just got carried away working with Photo Shop ??? 🎨
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