M.T.
M., when I had my first child, I took the attitude of, when she's ready, she'll let me know. Hahahahaha! When your kid is 3 years, 1 month and trains in 4 days, you've (I've) waited too long. Incentives and soft reminders aren't going to do it. Using the toilet isn't optional, it's expected behavior at three years old. She's shown you that she can use the toilet all day, so if she isn't doing it, she is choosing not to. Don't give her that choice. Do not ask if her if she needs to use the bathroom. Do not make it optional. Take her to the bathroom, every hour or so, without asking if she wants or needs to. Simply make it a part of the routine. Then when she pees her pants, do not say "it's ok" - if she didn't bother taking herself to the toilet or asking you to take her (but my three went by herself and did not require assistance), then she needs to learn that's not okay and that you are disappointed that she did not use the bathroom as you expected. I'm not saying to berate her, hit her or anything like that, but once you know they are capable, it is really okay for using the bathroom to be a rule, an expected behavior, just like anything else you expect such as wearing shoes outside and brushing teeth twice a day. It's not that your child didn't bother using the toilet all day, it's that you did not bother to take her. You may not think you have to be responsible for the toileting routine, but you do at this stage.
Good luck!