J.G.
You are expecting way too much from a 2.5 year old. It's a super distracting age. SInce she knows what to do, you will need to assist her in getting to the potty. Make games out of it (let's see who can make the biggest soap bubbles after going potty).
And please, stop with the pull-ups. She needs to ahve accidents, and you need to accept that accidents are a necessary part of potty learning. It sounds like you are creating a power struggle due to frustration. I suggest putting her in cloth trainers and just letting go of this emotionally.
And do expect accidents till around 4. Kids will pee themselves when upset, they will wait too long because they are playing with a friend, etc.