Herpes

Okay I read that a lot of people have herpes and never show synthoms, but my husbands grandma is different. About a year ago she had these bumps on her mouth so she went to the DR and said she got herpes from this guy she was dating.

I'm pregnant and she told my husband "I want to kiss the baby for good luck" okay I'm sorry but what ever she has it comes and goes a lot and she kissed her 8 year old grand daughter and that little girl gets the same thing on her mouth.

How can I keep her from kissing my baby???