Hi, this is Kimberly from landscape-solutions-for-you.
Thank you for asking the question on your Nandina berries. The berries will come back at the end of this year during their new growth period. There are many plant specimens that have berries on them. Birds love to feed on the berries. Birds will feed on the Nandina berries as well. Your daughter just beat them to it!
As long as the plant is healthy, you will have new berries for your enjoyment. Thanks again for asking the question on your Nandina. If you have any other questions on plants or landscape needs, feel free to ask right here at landscape solutions for you. Have a great day!
Kimberly