Grandmother with shingles

Mary

Help! My partner’s mum has shingles. She said that she is not contagious and is going to come and see the baby (note she didn’t ask…) but I’ve read online that, although shingles itself isn’t contagious, the carrier can spread chickenpox which is highly contagious… my baby is only 4 months old! Am I being paranoid or is it dangerous?