There were only a very few who knew that Taylin wanted to defect to AL. She didn't exactly publicize her intentions.
As for orders: the best spies and saboteurs always follow orders, up until the time that your betrayal can strike the crucial blow that turns the tide. You really only get that one chance to hit it big. Don't waste it on something small. Until then, do what you're told. Chances are that within the acceptable limits, you can still do small things to cause problems. Like delaying just a little so you arrive a turn late for a refit and throw off the schedule, setting your men on 25% retreat instead of 80%, doing only 4 hours of PW instead of "all your hours", hiring crappy troops instead of good troops, not carrying banners, not suggesting better strategies even though you know the one giving orders is making a huge mistake, etc.
