SInce it is the symbolic coming of age, i would write something about the future. For example "Congratulations on your Bat Mitzvah, thank you so much for inviting me/us. I wish you a lot of success...
Even though a Bat Mitzvah is a very religious ceremony for the turning age of 12 or 13,You can buy them a present you would buy a Non-Jewish person for their...
The same things boys have to do for their Bar Mitzvah: 1. Read from the Torah 2. Read from the Haftorah 3. Write a speech on her Torah portion 4. Write what it means to her to be a Jewish adult 5....