For JE, development of skills doesn't follow a smooth curve. There would be no signs she can do something, then suddenly she'll make A LOT of progress. This happened when she started to creep, then crawl, walk and talk. Toilet training is following the same pattern - from showing no signs of readiness, suddenly she was able to notify the need to pee/poo almost all the time. And she would take her pants and diapers off by herself too!
Ahem... a little privacy for me please Mummy?
The curve for this particular skill isn't going straight though. She's back to doing her business in the diaper at the moment. Have to be patient, especially now that we're transitioning to a new maid.