I wouldn't want to do consignment either. I hope you can work it out without doing consignment!
I don't have any real experience with this but I wanted to comment on my observations...
First in NY your cookies could easily be $12-15 each. (that "Recipe for Success" show on Food Network had a cookie lady doing really nice - but not as detailed as you selling for $15 each!) so I think that you or the shop owner should be able to sell your cookies for more than $6 ($1/inch). (maybe not to soccer moms but certainly to the clientel that the shop owner wants) I think that CBD is actually more than $1/inch so I would tell her to pay you your price and mark them up.
next, when I was in SoCal there was a Bakery Boutique (food and gift items) that had 6" cookies in the shop for $10 each! (they weren't very well done so I wanted to take a snapshot to show hubby what a lame cookie was going for, but they wouldn't allow photos
) I saw people ordering cakes and cookies at the counter, but didn't see people buy them from the store. Unfortunately for them, they disappeared after a few months.
finally, here in Indy there is a boutique at a mall that has adorable stuff and was carrying a few cookies. the cookies were nice but not in the same universe as yours! they were probably bigger than 6" and marked at $5.95! I doubt that they were on consignment because I just saw the pumpkin cookies on the -50% Thanksgiving merchandise table! They weren't marketed well in the store - just sitting on some table - I would have put them up near the register.
so, again, NO consignment. I think that these cookies a more special order and not like someone will pick them up and eat them on the spot. Probably good as gifts, or as part of a gift basket. I think that if she bought them from you, she'd be more likely to market them more.
ok, that was a bit rambling, but I would call other stores and try and find out about the consignment and also look into cookie prices. I think she should be able to charge at lot more than $1/inch for your AMAZING cookies. (I think that you should too!!!!)