Potty training is tough and frustrating. My daughter is now 3 and I started Potty Training at 2, stopped and started again at 2.5. My advise. Get rid of the pull ups. Use underwear and plastic pants or the heavier cotton training pants. (You can use pull ups at nap and night until she gets better control). I used a potty chair (and she transitioned her self to the big potty, there was no retraining). She was more comfortable on her little potty, she could get on and off by herself and she could tell when she peed and she needed her feet on the ground to help her poo (at first). Plus, the only time she could flush the big potty is when she had something to put in it from the little potty.
Praise praise praise. Make a huge deal over it when she goes. We put stickers right on the little potty so she could see her progress and she liked to put them on there. She is going to have a lot of accidents, so don't get mad or yell or punish. It is not a big deal and let her know that accidents happen and we will try to get to the potty quicker next time.
Also, you should take her every hour or two. Even if she just sits down for 2 seconds and gets back up. Try it for one solid weekend. If she doesn't get it, maybe give her a break (leave the potty out for her to see and sit on if she feels like it) and come back to potty training again in a month or so.
Good Luck