You can make a Bingo game: Make blank paper with 25 squares (5 x 5). Middle is a free space. Each guest fills in the other 24 squares themselves, with items that they think the mother-to-be will be opening in her baby gifts (ie: diapers, onsies, bottle, pacifier, etc). Then they make an "X" over each spot as the mom opens the gifts. Small prizes for the women who get a "Bingo". This is a nice game because it keeps the guests attentive while gifts are being opened, which can sometimes get boring.
Also: Make some sort of necklaces for guests with yarn. Have them bring a small baby item to the shower (such as a pacifier), if you want, to tye onto the necklace. Then, as people are talking amongst themselves, if they say a certain word, such as "Baby", and another guest calls them out on it, then they give them their necklace. Most necklaces at the end of the shower wins a prize.
Finally - Guess the baby food! Remove labels, number jars & have guests guess the baby food either just by look & smell, or let them taste with a toothpick.
And - just curious - where in the world do you work three jobs that you can take your baby with?!