L.O.
Do not ask her if she has to go.. she does not know.
Take her to the potty on a regular schedule.. every 30-45 minutes..
When she is consistently dry every 45 minutes increase the time to every 60 minutes. Do not ask.. say time to use the potty. take her to the potty.. it is not a choice.. time to go..
keep doing this for a long long time... months.. if it takes that long.. at some point.. she will get it... she will learn the body cues that she has to go.. but that takes time.. a long time...
Even once she is trained.. you will take her potty before you leave the house.. before she naps. before bed..
do not expect her to tell you.. you tell her time to go.. keep her in cotton undies full time except bedtime... no back and forth between diapers and undies..