i think you need to buy her something very thoughtful, it should be something like a nice spa day, tell her its because she works so hard and she deserves a break when really your getting the break if you know what i mean. she could go off for the day and you can set up your tank and she will come back all relaxed and in to much of a good mood to be upset at you. or do what i always do and set it up at a time where she is really busy, too busy to deal with you and she will forget about it although i have to warn you this plan can backfire and very very horribly. you'll be in the dog house for weeks. you could also get her involved by taking her to the LFS and letting her choose a couple fish {they dont have to be big or nice-hell they dont even need to survive the month} this will allow her to feel involved and can't talk or complain. you could also claim that the silicone bonds will break if the tank is allowed to stand in the air for too long and could result in a major costly leak {this one has a huge succes rate}.
trust me im really good at getting what i want lol, you just need to know how to talk and what moves to do and when lol