People will definitely have differing opinions on this... but 6 days is pretty far into development IMO. I'm not sure about turkeys but for chickens, the heart beats inside of the eggs on day 3. By day 6 they will definitely be developing if they are fertilized. This is why we couldn't bring ourselves to take the eggs from our broody hen when we realized she was sitting on them for more than three days... and now we have a bunch of healthy young chickens who were raised well by mommy! Again, this is a personal choice. If it were only a day or two I would more likely recommend tossing them.... but 6 days is pretty far in. I don't know as though it would make momma depressed or not, but there are definitely some little turkeys in those eggs if they are fertile and 6 days developed. If you let her hatch them it would be a great experience if you can handle it! I'm sure she'd be a great momma if she's been brooding them for this long

You need to post pics and updates if you decide to let her continue with them!
Good luck with whatever you choose!