she isnt old enough to comprehend her body with cause and effect. some kids dont like being wet, others dont care. some kids take months, some do it in one day and dont look back. i think she is old enough to start since you are already there with the sitting on it and possibly going. im just not sure if she is ready to be moer serious abnout it. use your judgement on that.
when you are serious about it,stop asking and start telling. you just say time to go potty, and just make sure she sits. do this every 30 mins. just have her sit no matter what. its not a choice. if she goes, give her praise or a very simple reward. what worked best was stamps. get some stamps and an ink pad and give her just one when she goes. it worked better than stickers and is inexpensive. its good to to have it when she goes out so you can show people. my daughter was very proud. i dont think food rewards are good. we also set a timer on the oven. before you knew it, she would run over and go by herself when she heard the bell. make sure the potty is in a central area easy to access but not right in the middle of the room. seeing it but still have some level of privacy if wanted.
dont worry about poop unless she brings it up. poop was way harder and scary to kids, esp if they have one bad experience.
it could take months, or days. just depends on her. accidents are common though. after she is consistantly going for a long period, you can experiment when you will be home a few days, to ask her if she has to go and dont make her sit till she says yes.
my sister and i both agreed potty was the hardest thing to teach your children. just dont stress. if its too much for anyone, just wait a month or 2 before trying again. good luck