Whitney Claire Kaufman

“Mamma Mia” contains more than 20 of ABBA’s best-known songs, including the finale of “Dancing Queen.” (Courtesy of Joan Marcus)

By DANA BARBUTO – The Patriot Ledger

Playing Sophie on opening night was understudy Whitney Claire Kaufman – whose voice is as pure and sweet as the character she played, and played well. She’s a star in the making.