I vote no, unless you include a very personal note acknowledging her loss, grief and pain; but I would still say call her instead or do nothing. Since she knows you were pregnant, she probably knows you had the baby, or are close to it, and doesn't need the reminder, especially not in a cold, impersonal baby announcement. I've not been in the situation either, but have known many women who have experienced baby loss (whether infertility, miscarriage, stillbirth, or neonatal death), and they almost uniformly say that it is difficult for them to deal with the repeated reminders that not only did their baby die (or they can't have one to start with), but that other women are experiencing the joy they fully expected themselves to have. It doesn't mean they wish the same sadness on others, but just that it's a knife to their heart, every announcement.