An idea for a game/activity is a memory book for the new mom.
Each guest writes down a story or memory they have of the mom and a compliment about her as a person. It can be something from when she was little or a fun memory from friends or college roommates. It doesn’t have to be long - just something that stands out in their memory about the mother-to-be.
Then when the new mom is feeling overwhelmed and tired she can get out her book and read the memories and compliments that guests have written about her. This may give her a chuckle during stressful time and get her mind on something else.
You can buy a journal type book with decorative pages or make some scrapbook pages of your own and glue the papers with the comments on them inside your book.