So FI and I have these friends, his BF from the Military, whom we hang out with when his BF is not deployed. He just returned from Afghanistan last week and therefore his wife and 3yr old daughter moved back to Washington as well. (His wife always moves back to Montana when he is deployed for over 8 months) Last year, when I had first started planning our wedding they were all still in town and his Wife had asked me about her daughter being our flower girl. FI and myself do not have family in the flower girl age range so I told her that would be nice and we should talk about it later. (Kinda being put on the spot) Then they moved away and I thought I had gotten out of this whole flower girl thing.
Last week, she had called to see if we wanted to go out to dinner and she asked me if I still wanted her daughter to be our flower girl. I politely told her that the wedding is in 27 days and I didn't really have time to throw the whole flower girl thing together and that I had way too much to do and I would really like it if they could just enjoy themselves as our guests and basically don't worry about it.
Flash forward to last night, we are at their house and she BRINGS IT UP AGAIN! Only this time in front of FI, her husband and her 3yr old daughter. AH! Basically all three of them were saying how nice it would be and I felt awkward saying no. So I start making excuses like... well she doesn't have a dress and she says "oh she still fits in the dress she wore to be the flower girl at my brother's wedding last summer. Then I said well she needs a basket, somehow the basket she used last summer just happened to be sitting in the living room. So she runs and grabs the dress to show me and it's virgin white! My dress, the tuxes, table linens everything is ivory! I didn't know what to say and now I'm freaking out! Plus her daughter has grown 6 inches from last year how could it fit!?
What should I do!?

