With all due respect, I don't think the "Noise blocking" is good enough in those since she wants 100% noise block as I understand!

Hi Laurie, I'm new here too and didn't want to start a thread. Not sure whether this is going to help, But try keywords "Active noise cancelling" (ANC) on forums. ANC is a technology that create a opposite waveforms to cancel out the sound coming from outside. You won't hear a thing with these...