Tough time potty training my little over 2 yr old daughter?

I've heard over and over that it is easy to potty train little grils. Being living proof, I find this theory invalid. She is a little over 2 yrs old, and I have watched for every sign that she is ready. She goes hours, and I mean hours without wetting her diaper, and she usually goes poo right after lunch....in her diaper. I have put her on the potty for the last month right after lunch, hoping she will go in it. And I can put her on the potty for 20 mins at a time several times a day, and NOTHING happens, not even a smidge of pee. She is showing every indication she is ready to be trained. Sleeping all night without a wet diaper should be a sure sign, or so I've been told and read. Professional and friend advice is sooo false. Any other advice out there?