Hi Richard, personally, I don't think you over-smoothed it. I can still see some very realistic texture in her skin, so I think you stopped at a good point. It looks like you have added some slight diffusion to the entire picture, which is also pleasant on the eyes.
I agree that this looks pretty good to me. I also agree that you have lost some sharpness, but in total it is still ok. I´d prefer it a bit crisper though.
Obviously it might depend on the expectations of the model ...
What I sometimes do is that I leave some single spots by using a light "restore" brush on them - that way you can still us PP to remove the majority, still it give a fairly natural expression, because hardly anyone has the 100% perfect skin ...