[AOIIBrandi]

I think (hope) the Bride would be really upset if she found out her Mother and Sister were pressuring people to give gifts that are outside their means.

I am not saying tell the Bride about it, but I would tell the sister. I tend to be a very blunt straight forward person, so I would just tell the sister that: "While you are happy to be in the wedding, and realize that there are certain extra costs involved, but that you already spent more than you had planned on the shower gift and that you cannot afford to give $100 for the wedding gift as well." I would also maybe throw in that you did have to purchase an airline ticket to get there (additional cost some of the others may not have had to pay) and that you would be happy to chip in what you had planned to spend on the wedding gift, but if that is not satisfactory you will send your gift seperate of everyone else.

DO NOT let these people pressure you into not being able to pay your bills. Some people get squeamish about actually telling people you don't have the money, but I think if they are going to pressure you being straight forward is the best way.