The bottom line is: Her part just wasn't big enough to have ruined anything. If you'd like a refund, ask Eli Wallach or George Hamilton.
As I've posted before, in the theatre where I saw it, by the end of the film people were laughing out loud at her lines. That certainly ruined the mood.
"Dad?"
"I got news for you. If it wasn't for the toilet, there would be no books." --- George Costanza.
