Herpes, Kisses, Need advice!

Well this is a long story so I'm going to try and use bullet points to try and catch you guys up quickly. So my newborn son has a mass in his lungs. He is extremely likely to catch a cold and then form pneumonia. He came unexpectedly at 35 weeks. At the time of my water breaking I had a herpes outbreak. He went to the NICU they did a spinal tap (Which is how they find out if babies have it.) And they started the anti viral medication. It was the worst 5 days of my life. He came back healthy. He didn't catch it. Thank the universe. Anywho, my husband and I before our son came had a many discussions on who would be aloud to visist. We decided only immediate family who agreed to get their flu shot until our son has surgery. Fast forward to today, his mom invited his grandmother over to visist tomorrow. My husband asked if she had her flu shot, they responded yes. I was upset because this is not what we agreed on. And she refuses to follow my "No kiss" policy. When she met my first son for the first time, she smiled and said I just can't listen to you and she kissed him all over. And continued to everytime she saw him. My husband never said anything to her. But my first son didn't have any other medical issues either. Anywho, this women isn't going to listen to my no kiss policy and I honestly don't know what to do. 90% of adults have cold sores. And I cannot watch my baby have another spinal. And i am not going to assume his grandmother is in the 10% No matter what she says. But i also don't want to hurt my husband. I hate this. Help!