Bridal Shower Invitation Etiquette Question

I am one of four bridesmaids in a friend`s wedding. Over the last two weeks, I have been given sporadic information about an upcoming bridal shower by the maid of honor. This past weekend, I received an invitation to the shower. Interestingly, the invitation noted that the maid of honor, mother of the bride and another bridesmaid were "hosting" the shower. Yesterday, I received an email from the maid of honor asking for assistance with the shower including a request to share in the cost of the event. Since I was not including in the planning and I was not included as a bridesmaid "hosting" the shower, I would think that I would not need to write a check for the event. If the shower would have been handled differently from the start, I would not have had a problem contributing my time and money; however, at this point, I think it is in poor taste to request money from a bridesmaid ommitted from the planning process and the shower invitation. I need some advice!! I don`t want to be a jerk about it and I am not sure if I should even bring it up. Thanks for your help!!