I had three showers - one with DH's family, one with my family, and one with some friends. The shower with my family consisted of my mom and I meeting my two aunts for lunch at a restaurant, and they gave me some small gifts and cards. The one with my friends was a "blue elephant" gift, which was like a white elephant gifting, except it should be blue, since that's my favorite color. I got notebooks, some pens/pencils, dice, all sorts of random stuff. It was actually very awesome, because it was so random and off the wall. The one with DH's family was the most "traditional" shower, and I found it not fun at all. I was the center of attention while opening presents, but the rest of it was done with regard to what other people liked/wanted and not what I would have wanted. So I was very uncomfortable because I couldn't eat the food, only had water to drink (because apparently I was the first person over 21 the hostess had ever encountered who didn't drink alcohol), and didn't know how to play the shower games that everyone else knew.
That being said, all of my showers were with very different groups of people, who would never have been invited to my other showers (my mom and aunts live in a different state!), so I didn't feel that having so many showers was a terrible faux pas.
Three showers for the same set of guests is pretty terrible though. I agree with the "accept one, decline two" idea, if she wants to go at all.