I would bet there is no law against painting her home purple with pink polka-dots. If she if forced to remove the garden she should paint the home and watch how fast people change their minds on how nice the garden looked as opposed to the pink and purple clown-like house.
These kind of incidents are awful and the town needs to made a fool of, from what I understand people have painted their homes ridiculous colors in protest over similar issues.
Purple house with pink polka dots at UVM Burlington Vermont | Flickr - Photo Sharing!
If she had the time and money I would say do it, how much would a few gallons of paint cost in comparison to the price of her freedom anyway. The house color could be changed back on a whims notice if/when the time is right.