After a week of deliberation, the beret did indeed go swimming in the frog-pond. And up out of it rose... a beret!
The new beret has been knitted on 2.75mm and 3.50mm needles [a smaller size than the smaller size used previously!!] - now, naturally enough, the beret fabric is tighter but the beret is too small for an adult's head - even for an adult's small head. But that's okay - it will fit an older child who will love the pink, mauve and yellow combination of my hand-dyed yarn.
As for the second 50g skein that was in the original; it is resting - waiting for me to realise what it was always meant to become!
So, a win all round - I successfully completed my beret [though I'm not entirely happy with the way the fabric bunches]; and a young lady somewhere will get a beautiful, one-of-a-kind beret.