As much as they can be annoying aggression towards your wife is never acceptable...
Lol but seriously, if it where me I would set her up and have a come to jesus moment. Sounds like she is being a jerk. Have the wife handle her a lot and feed her by hand.
Such shy animals are in all circumstances an encumbrance to their owner, who must be ashamed of such a dog, and a disgrace to their race. Under no circumstances whatever must they be used for breeding, however noble and striking they may appear.