#1 - Get rid of the pullups during the day. Kids need to connect more with cues and feelings during toileting and pullups during the day may be cleaner and neater but I feel they get in the way of this. This practice works with peeing also, because children at this stage are just beginning to read their body signals and tune into them. Up until that point, they have just been wandering around, pooping and peeing at will and not even paying attention.
#2 - Let her choose some wonderful underpants - special ones with her favorite characters on them. Let her choose them at the store and make a big deal over them. Let her wear them during the day and make a big deal about them when she puts them on. Just remember, children at this age are not conscious of what their bodies do - that's why they suddenly have "POTTY" urges outdoors when playing or when shopping and there is about a 20-second window of opportunity before they go in their pants. By the time they are aware they need to go, they have already started. Your job is to help them become conscious of "when". Because pooping can be better predicted and doesn't happen as often as peeing, this one is usually easier.
There will be accidents - don't make a big deal about them. Just help her change and go from there. She will feel bad about pooping in her Dora or Tinkerbell undies. Good! That's the idea! She will begin to anticipate potty time and start to regulate herself.
I want to add something here about over-congratulating children: When we parents try to reinforce good behavior with our very young children, we sometimes have a really b-a-a-a-d habit of making a big deal over every little burp, snort or hiccup coming from our kids. There is a fine line between offering positive reinforcement and giving empty compliments that confuse children and do absolutely nothing for their self-esteem. When that line is crossed, we may end up with inconsiderate, precocious, demanding children who tell US when they want to go to bed and in what restaurant they will be eating their dinner. They will interrupt our adult conversations because they feel they have something important to say. Beware!!