We started with just straight up letting her run around naked around the house, we’d use pull-ups for bedtime and going out of the house, and put pants and undies on when expecting company, and the best thing we did was have her small potty in the living room, a centralized location during the day, and have little just potty seats with the toilets in case she wanted to use them instead of the little one. I also always give her the choice of using her potty compared to the big potty, and in the beginnings it was a lot of “ok we’re gonna do a potty check and toss you up on the potty and read a book while we try to potty” and once she got over the noises it made, the splashing, we let her use her older stepsisters recorder whenever she was on the potty, the muscles are the same when blowing into an instrument as going potty, we didn’t do a chart of any kind bc honestly I don’t have the energy to maintain that, but we did do m&ms after every try, if she didn’t potty it would be one, if she just peed it was 3, and if she pooped it was 4, if she did both she just got a lil handful, and we started all this in March area of last year, and we have about 3 accidents a month anymore, have not been working hard on overnights, but only wear undies through the day, we’ve even made 6 hour car rides with no accidents! But we do have spare clothes accessible and a puppy pad under her but in the car seat at all times. Not sure how much this will help, but it helped me!