XP: Giving Unequal Shower Host Gifts?

Basic situation:
-Aunt and BMs wanted to throw shower; I asked if they would all mind working together. Gave Aunt and MOH each other's info.
-Aunt has been waaaay excited and doing things super early; MOH has been waaaay busy and not very responsive to emails/phone calls.
-BM, we'll call her D, was super excited about shower; i asked if MOH had said anything to her about it and she said no but she had lots of ideas, etc. I asked if i could give my Aunt her contact info and D said yes.
-D and my Aunt have thrown themselves into shower planning, and although the shower is still technically being hosted by the whole BP + Aunt, I know that it's really Aunt and D doing 90% of the work

I don't want to do an etiquette no-no, or upset any of my other BMs, but is it ok to get Aunt and D slightly bigger thank-you gifts? (like, a larger bottle of wine than what i'm giving to the other girls or something like that?)

i know i don't have to give them in front of each other, but still they might talk about what they got.  But I'd really like to acknowledge that D's gone to a lot of effort and planning and whatnot with my Aunt. So, what do you think?