God no don't stop, you've already left it quite late and its much harder the later you are. You don't ask if she needs a wee, just take her for a wee "finish this program then we're going for a wee and to the park" "finish your lunch then we'll have a wee and get the crayons out." "All done, great, toilet time, lets go.". And I wouldn't fight or force but I would just carry to the bathroom if they won't go. The same you carry them to bed or to the car when they won't leave the park. It's time to go, you can walk nicely or I'll carry you. we wouldn't leave the bathroom until DS had been and I'd just sit and wait, not really paying attention to him. It's boring and they learn to just get on with it than waste play time. Especially if the wasted time has consequences, like less time a the park or needing to leave softplay straight away because they've wasted play time. Go the toilet say have a wee and we can go play for 10 more minutes, quick though or we won't have time.
I don't see the point of bribery for using the toilet. It's an essential thing you don't get rewarded for it. I don't do rewards for brushing teeth, having a bath, washing hands etc I don't think it does kids well to learn that they should be rewarded for basic requirements. That's how you end up with a bloke thinking he deserves sex because he hoovered up imo.
It's just a clear boundary. You're a big girl, big girls don't wear nappies, they use the toilet.
When she makes a mess on the floor she cleans it up. Normal consequences, we clean up after ourselves. You spill a drink you clean it up. You get your toys out you put them away. Etc etc. you pee on the floor, oh oops, heres some kitchen roll, wipe it up, I'll go get some spray while you do that. With the poo I'd clean up the big bit then give her the wipes to wipe the floor. It's your poo, you need to clean it up, here I'll help you. Next time lets poop in the toilet, much easier to clean up isn't it.
It's not about punishment or rewards. It's just this is life, life is easy when we do this, life is hard when we do that.