Daughter will be 4 in March - potty trained late but still can't get past #2

We followed the whole "when your kid is ready" thing until recently. We realized that if we didn't give her some sort of reason for using the potty, she wouldn't. She's perfectly fine doing all her business in her pull-ups.That changed about a month ago when someone here suggested we reward her with small "prizes", little dollar-store toys she gets to pick from a box if she uses the potty. This was enough to push her.She can pee regularly on it, 90% of the time. She still has the occasional accident though, which I understand and we don't make a big deal out of.The major issue is pooping. She just refuses to do it and gets really angry if we try to encourage her to sit on the potty instead of standing right in front of it and shitting herself (which is both funny and frustrating at the same time).She's already starting to hold it in too. This is where I didn't want to be. We've heard stories in our own family circle where the parents try to be forceful or getting angry/reacting poorly, only to have major issues with their kids holding it in for DAYS and then actually needing to go the doctors, etc. Now, granted these kids are much younger, usually 2 or 3, so it may not apply to my daughter, but I'm still afraid of it happening.So far, we've been really patient with her, not trying to force her but we're also looking to get passed this point before she turns 4.I've browsed through the archived posts here and found two helpful previously suggested tips, can you comment on these and perhaps suggest any others that worked for you?Things I'm considering:Bottomless - right now she's wearing underwear (NOT pull-ups though) and someone suggested removing everything. They said that the fact that the poop goes on the floor helped push it. I guess even kids find shitting on the floor gross lol.Help cleaning up the mess - This is where I'm not sure... My daughter is sensitive to this sort of thing; I'm afraid if I make her help clean it up, it will push her away from the potty and that she'll start to hold in her shitsAny help is appreciated. Just... please don't say "when she's ready" - she's almost 4. She's going to be going to school soon and they don't have the option to simply "do it when they're ready"... via /r/Parenting http://ift.tt/2gIBxiE