She doesn't really need the milk now if she is on a balanced puppy food and just regular lactose free milk wouldn't be as beneficial as formulated puppy milk anyway. Though if she really enjoys it you can give it as a treat.
Chicken wings are good, she will be able the crunch the bones up eventually but if she is picking them clean now she is at least still giving her teeth a work out.
Just be careful of the small bone in the wing and that she doesn't try to swallow it whole. Once she is big enough I prefer feeding chicken necks to chicken wings, I find they are safer but that's personal opinion.
You can also give her beef bones (raw) but introduce in small amounts at first to avoid an upset stomach. I know several breeders who plonk bones in the pups pens before they are even fully weaned.