Welcome to YT.
How much does she weigh?
All Yorkies are members of the toy group.
Dewclaws can be removed without anesthesia 3-5 or so days after birth. After that, it requires anesthesia, is somewhat harder on them, but as far as I know it can be done any time. While I do not like dewclaws and I wish Ellie's had been removed, she is 8 and we have had no major problems.
There are different recommendations on the best time to spay because there can be some developmental differences in dogs spayed early, but for the most part in small breeds, somewhere around the six month mark should be fine as long as they weigh enough (and what enough is depends on your vet). A dog who is spayed before her first heat has a less than .5% chance of getting mammary cancer. When spayed after the first and before the second, it goes up to 8%. Anytime after the second heat it goes up to 26%.