Are you missing out the fact that you bought a very expensive bike and a large amount of commuting gear for it to be only used twice a week? If not then she's just being a pain.

Before my wife conceeded to letting me buy an expensive bike (bought today!) I commuted every day for 6 months, joined a cycling club and ride in the evenings. Then finally before I I bought the bike I sold my car to finance it, forcing me to become a bike commuter. I think this was the right course of action in my case as anytime someone completely changes their lifestyle it's worth waiting to see if they'll revert.