how does daisy react to the phone calls from tom's woman in new york?

At first, when Tom is called away, Daisy ignores it, only seeming to react as the call had "quickened something within her." However, after calling Nick "a rose" and saying it was delight to have him there, she gets up from the table and goes into the hosue.

When she comes back with Tom, Daisy babbles a bit about how "romantic" the evening is. She is obviously rattled by the phone call, but tries to play it off in high spirits. The rest of the dinner is tense and mostly quiet.

It isn't until after dinner, when Nick goes outside with Daisy, that she betrays some of what she was really feeling. Daisy says this this:

“Well, I’ve had a very bad time, Nick, and I’m pretty cynical about everything.”

It is clear that Daisy is fully aware of her husband's indiscretions, and is unhappy. She goes on to talk about her daughter, and says that she wishes her daughter would grow up a "fool". Daisy suggests here that to be a fool would be to have happiness - as if she believes that if she didn't know about Tom's woman, she herself would be happier.

She acts unconcerned and unbothered about it but deep inside she cares that much