Depends on personal preference and personal fit a bit, but the women in my family all like Skinfit - very thin fleece pads but nearly friction-free. We've also had luck with Assos and Rapha women's line if you like thick pads. Wiggle's house-brand, dhb, is a favourite of my partner's - very high quality for a low price, and their ASV line is her to-go kit for long days. We recently clocked several 4-7hr rides in a single holiday week and she survived better than I did (though I wasn't on my personal bike).
Unlike previous suggestions, I don't think relying on thick applications of chamois cream is a solution. It's masking the problem, which can backfire should you ever find yourself without the cream. If you "need" cream to survive the ride, something else is wrong - perhaps a badly located seam or a wrong-sized garment - because cycle clothing is supposed to move with the skin, not rub against it - and if points of motion have a seam then it's a badly-placed one. I still have a tub of 4 year old cream in my fridge that I never got around to using.
ZONE3 - We Last Longer