Just posted in your other thread - so glad that the FHO is an option. You may be looking at it sooner than later, but so glad that you are there to take care of her.
Hopefully the joint supplements will start to bring some relief - you really don't want to use the pain killers on a dog so young, they can be very toxic to the liver and kidneys.
You are in Canada, wonder if the vet would consider cartrophen ( http://cartrophen.com/
), or if it's not applicable in this situation. (This is not available in the US.)