Hi saintsgal,
Talk about sexism eh? I don't know about the Uk, I would think it will be some time until retailers here start stocking women's jerseys. I can recommend windycitywholesale in the US though. I checked his store and he has several Saints women's jerseys. Here's one, 120391105449, check it out and then you'll be able to see the others he has too.
Lots of the members here have bought from him with no problems at all. Hope this helps.