I haven't read any of the other responses, so I do apologize if I repeat them!
My daughter is 19 months old and we have been teaching her about the potty for 5 months now. We started her early, but since she was born, she would wake up to poo and even just to pee! I figure I would be fair to her and show her the potty really early and she could go at her pace! She was peed on it a few times, and she will sit on it and try, but we know she is still so young so we don't push it! We have put her in "easy ups"/potty training pants, and she knows the difference between the trainer pants and the diapers. she tells us that diapers are for babies and she wants the "big girls"! I would suggest going to the training pants and letting her know that those are her big girl pants, but if she thinks they are diapers, explain that they are for big girls, and they just help keep accidents off her other clothing! This makes clean up easier for you, but doesn't put her back at baby level!
Like yours, my daughter tells me during or right after she goes! They are still young! My mom set up a system with my little sister, 25 months old, where they set a timer for 30-45 minutes after she tries and goes. This worked for them for a week straight, my sister was clean for the full week. They set the timer for 30 min if she just tried and 45-60 if she actually goes. We are going to try this with my daughter, cause when we were there 2 weeks ago, my daughter got excited for the "potty timer" and she would go in with my sister and try.
My daughter completely understands the what the potty is for, just doesn't tell me before she has to go. She will sit on her potty, completely clothed, and go in her diaper or in her "big girls"! I would just take it slow, at your daughter's pace. she will be completely trained when she is ready! Don't get frustrated, but do get some kind of a training pants instead!
Good luck annd remember she is still young!