Okay ladies I really need your opinions on this,

Dcg gets dropped off this morning, about 15 mins later, she lets out this Barky (croupy sounding) cough. I can hear a " rattle" sounding coming from her chest. Not at a ful blown wheeze. I sent mom a text right away, she text me back saying she was fine yesterday, but she didn't see her this morning, as she leaves early for work, and asked me to keep my eyes on her. Which of course I am doing.
She ate lunch fine, she's sleeping now, has coughed a few times, no fever as of yet, played fine all morning.
My question, do I tell them to have her checked out and not to bring her tomorrow?
I'm concerned since, this family is hearing impaired. Dad no hearing what so ever, mom is 95% hearing impaired. But dcg hears fine. Dad can't even hear the sound of the cough or rattle/wheeze. Do I wait and text later tonight asking how she is? I just don't know how to handle this.

Please help me make the right judgement call.