What are the most effective ways to potty train?

Make her want it. My experience is that kids truly can potty train when they care if they are wet most of the time. When they want to be immediately changed 80-90% of the time, they generally can be trained within about 2 weeks. This stage of development does have variability, generally anywhere from 18mos- 3 years. Remember, nobody goes to kindergarten in diapers. All kids train, if healthy.
Care if Wet. My experience is that kids truly can potty train when they care if they are wet most of the time. When they want to be immediately changed 80-90% of the time, they generally can be trained within about 2 weeks. This stage of development does have variability, generally anywhere from 18mos-3y/a. Remember, nobody goes to kindergarten in diapers. All kids train, if healthy.
Non-PC hints. Unless you & your daughter are ardent feminists & refuse to be objectified, she may like wearing " pretty girl panties." A boy may like standing on a "Little Looster" stool to pee on a target like a Cheerio, if rewarded by chest bumps & fist-pumps. Let either gender sit on the toilet for15 minutes, 15 minutes after a meal, legs on Looster, knees flexed. Let'em blow bubbles, sing, no screen time.