Phyllis Wallach has the following credits in BlueGobo's database, although is not necessarily featured in video or photos for the below productions.
No, No, Nanette
[Broadway Revival, 1971]
Fiddler on the Roof
[Original Broadway Production, 1964]
Shprintze (understudy) (replacement)
Bielke (understudy) (replacement)
Grandma Tzeitel (understudy) (replacement)