Ditch the pull ups. They will only confuse her. (I believe in going cold turkey with nappies, and using pull ups only at night).
This is how I potty trained, and it worked 3 times:
When the child is ready (and 2.5 sounds good to me) Explain what you are both going to do.
Book a week in your diary not to go anywhere (this can be tricky if you have older children to pick up from school, I appreciate.)
Have a potty near each loo in your house, the garden if it's summer, and downstairs if you have no downstaris loo.
Forget pants this week.
Let your DC see you wee, in the loo, so they know what they should be doing on the potty. DD didn't get I wanted her to poo in the potty as well as wee, because she had never seen anyone poo. Once she knew she wasn't the only person on the planet who pooed she was well away.
If she is upset today, that is good.It shows she has recognised what she has done, and should be able to correct it by weeing in the potty.
Personally I never used sweets as rewards, or reward charts, but did do lots of clapping when things went well. I ignored accidents, or just said "Oh well".