M.F.
It's wonderful that you love and care so much for your step-daughter! If I were you, I would reserve a day shortly before or after Mother's Day and tell hubby that day you all are going to celebrate Step-mommy's Day! Plan an outing to the nearest childrens museum or butterfly house, etc and make plans to go to a family friendly restaurant. Men just don't think of these things... Enjoy your special day and make it an annual tradition!