She performed as a singer with Hammerstein at the Manhattan Opera House. The opera house was built by Hammerstein and opened in 1906. It still stands at 34th Street (Manhattan). When she came to America she spoke only Italian. Trentini studied English diligently, repeating words and phrases over and over. One difficulty for her was that she sometimes attached an incorrect meaning to a word. An example of this was when she thanked a member of the opera house staff for a favor and uttered "Kiss Me" instead of "Thank You". She said the words again and again until a linguist corrected her. At that point she fled the room, returning to her hotel to say "Thank You" repeatedly!