Hi Jo,
Yes as benny said it's better to try the fit in a shop, better if with socks on.
However, Cressi fins have quite a narrow footpocket, so that should be good for an average female foot. I have a feeling that Cressi gara 3000 LD freediving fins might be a good choice for you, but it's much, much better if you can go to a shop and try them on your feet before buying.
Bali? Sooo jealous!
