can she have her  booster?

I personally would leave it until after pups have left for their new homes.

Definitely leave well alone. My bitch is due her booster and won't get it until our pups have left.

Hope this helps.

If you booster her now the pups could have too much maternal antibodies and their own vaccinations won't take well.  Wait until after she weans them.

Yeap ,leave well alone until pups have been well and truly weaned.

I was in the same position with one of my girls, and, although the vet checked what the manufacturer recommended, and told me that it was safe, I wasn't convinced. 

I waited and had her booster when pups were 5 weeks old.