Hi! Everyone!

I twisted away, shyly, under the broad pink-gummed smile of Mrs. Cameron.

In the above sentence, "pink-gummed smile", what is that supposed to mean?

Was the lady chewing pink colored gum?

It just means that she had such a big, wide smile that you could see not only her teeth but also her healthy pink gums.

Best wishes, Clive
Oh!, I see...

Thanks, Clive....