my daughter was potty trained 2 months before she turned 3.
bottom line with potty training is that you can't force it.
you can *only* praise it, and her efforts.
explain to her about going potty.
what peeing in the toilet feels like - break it down step-by-step...
my daughter was particularly motivated by the "big girl" label.
she was desperate to be called a big girl.
so each time she randomly used the potty I'd praise her "you're getting SO close to being a REAL big girl!"
When she started asking for the toilet more consistently I put her in "big girl" panties- so when she had an accident she would know it... and so that she would feel like I was validating her becoming a "big girl".
Also- when in panties- I would ask every 15-20 minutes "do you have to pee pee??"
Fortunately she caught onto pooping really fast-
for me and my daughter the "magic" was in figuring out what motivated her, and giving her the time and patience to "learn" how to use the toilet.
for peace of mind- there are no normal adults in diapers for lack of learning to use the toilet. Only special cirumstance prevents that from happening (accidents, illness, birth defect, etc...) so- don't worry- just work with her and be patient.....
Good luck!