Hi Doc,
Just now seeing your thread, I am on holiday and intermittent access to the internet.
I firmly believe some of the important commands a dog needs to know is "drop it" and |leave it" You could also add in "Give it".
It sounds like you have not worked either of these with your gal. Time to start. Use treats for trades initially. YorkieTalk Jilly always has some great detailed advice, I think she probably has some thread on here about drop it or leave it
But your gal should never ever snarl or snap at her family. That is bad behaviour at its' worst. Time-outs are great, but so is a very firm and disgusted NO.
Now I have an eight month old large gal, who is entering into adolescence, and she has been taught bite inhibition since she was 8wks old. But she as all the breed loves to do, is to take their owners mouth in their jaw. This absolutely can not be allowed. For one thing it would scare the bejusus out of any guest we had in the home, if she would do it to them. So here we are eight months in, and she is still doing it to myself and hubby. These last two weeks she has been very very strongly disciplined for it! And immediately crated for lets say 10-15 minutes. And the second infraction she is taken out of the den, into a room by herself.
If she ever growled or snarled at us, she would be crated over-night, and fed in her crate, and separated from the family members.
Razzle our YT has wanted to resource guard us/most especially me, and immediately he is removed from the bed or the chair, or my lap, and crated.
Stick to your guns, start training with your gal on Drop it/ Leave it etc, and hopefully your Russian wife will see the benefits of same