"You would say she was making no effort to conceal her happiness, is that right?"

At least in part, they made an effort to conceal themselves.

Someone had left the trail, and was making no effort to conceal his approach.

The other car made no effort to conceal its presence.

She seemed to be making no effort to conceal her curiosity.

The big difference was that this one made no effort to conceal itself.

There was no effort to conceal the pride she felt.

In his remarks, the judge made no effort to conceal how he had come to feel about the man before him.

She made no effort to conceal her joy at the idea of a personal meeting.

In fact, she was making no effort to conceal her skepticism.