It' was niggling me since Lissie mentioned it so have googled:
"Is turkey meat ok for dogs?
Yes, dogs can most definitely eat turkey, as a general rule.
Many premium dog food blends are made with turkey.
What IS NOT good for dogs are turkey skin, bones or turkey fat. Also, make sure that no onions have come in contact with the turkey since onions ARE toxic to dogs. To a slightly lesser extent, garlic isn't great for dogs, either. Many foods and treats for dogs contain garlic, but many dogs cannot tolerate it and some can be fatally allergic to it."
This turkey was always intended for her so was cooked completely plain, with just a little water, and I stripped the skin off as soon as it was cool enough. The juice has been in the fridge so all the fat is in a layer on top, which I will take off. So it looks like it's fine
Incidentally, I didn't know about onions till I was searching about food for her since she's been ill. Not that we would ever have fed her actual onions, but she might have had a bit of gravy, when I'd cooked meat on a bed of onion.