If you use iPhone, you probably know this Siri App in which you ask Siri robot a question and it will answer you.
Before you can ask a question, you have to say "Hi Siri" first or else the app will not start to work.
My daughter can say "Hi Siri" correctly without any problem in a normal conversation.
However, she is a bit nervous when she says "Hi Siri" to Siri. And she starts to "act too much" or "say it unnaturally" and as a result the app couldn't understand what she is saying.
Do we say "she acts too much" when she feels nervous and says a phrase with unnatural intonation like that?
Or is there another phrase for it?