Re: What cues do you see?
Right after he wakes up in the morning he gets wide eyes and usually has to pee & poo. I haven't been doing naked time though I do let him be diaper free when we are in the kitchen but I usually have a diaper on him b/c it's hard to get every pee with 2 other LO's to look after. We often use a "prefold belt" (just a waist band from an old pair of baby pants, actually) and a prefold so we can tell right away when he's wet and he can be changed right away. So he doesn't like it when he's wet and usually will fuss when he pees in a diaper (though not always.)
So you could start off simple... like after she wakes up in the morning or from a nap.
I'm also wondering how old she is b/c that can be helpful for giving advice with EC