special way to tell MIL baby name

since we've told my husbands family we were pregnant my MIL has been calling the baby J.C. mine and my husbands initials. we found out it's a girl and are considering the name Jaycee but want to find a special way to announce it to her since she helped us pick it. she doesn't even know were considering that as a name. this is also her first granddaughter. she has two grandsons.