My officiant is a family friend who I have known since my late teens. She has officiated many weddings and is the most lovely person and I am so excited to have her help guide us through vows. That being said, we are having a small wedding (~80) with our closest family and friends. I plan on inviting her to stay for the reception since she is a family friend and also friends with my mom. However, if she weren't officiating she wouldn't necessarily be invited as we're trying to keep it small. Do I send her a formal invitation or just let her know that we would love to have her at the reception? Thanks!