I agree games aren't really necessary but if your friends would like to play some games, here are some:
1) Guess how big her belly is by using yarn. I know some people get very offended by this so ask her first if she would mind having people guess how big she is.
2) Don't say "baby" game. Each guest gets a diaper pin when they arrive (Babies R Us has colored diaper pins). When person A says the word "baby", then person B can take away person A's diaper pin. The person with the most diaper pins at the end of the shower wins the game. This is easy because it doesn't take any time and people who aren't into games just say "baby" right away which is fine but then some people really have fun with it. You can make a rule that if someone who has lots of pins says "baby" they have to give up all their pins, not just one pin.
3) Guess the baby food. Pass around jars of unmarked baby food and people write down what they think it is....there isn't any tasting of the food...just guess by sight (you could smell if you wanted to)
4) Celebrity baby. Haven't played this one but I've heard about it. Every guest gets a celebrity baby name put on their forehead or their back so they don't know the name (i.e. Suri Cruise) People have to guess what celebrity baby they have by using/asking clues....like if you had Suri Cruise you'd say "your haircut is so popular that adults are getting it"....I don't know the rules of this one.
Have fun!