B.S.
You shouldn't *ask* her if she needs to go potty. A two year old is fighting for control and independence. She will always say *no*. You need to be firm, but loving, and tell her it's time to go potty. You'll have to stop what you are doing and take her each time; until she realizes that you mean business. Daycares and MDOs will take the children at regular intervals and this is exactly what you need to do. No more diapers or pull-ups unless it's at nighttime. Celebrate when she succeeds and especially when she begins to tell you or do it herself. Keep your cool and sense of humor. If you get upset that's all she needs to know she can aggravate you this way. Food issues and potty issues are two things a child can control and they'll do it if they think they can get away with it. Don't let her get the upper hand. The first spring/summer after turning two is when we look to do the potty training in daycare. Some children will do it sooner....some are almost three before they show an interest.
I, also, recommend a DVD call "Potty Power" that my daycare children *love*. Even my tiniest ones will stick their arms in the air and yell "Potty Power"! We watch it at least twice a day.