N.L.
I'm with Sandra H...spare the rod spoil, the child...
We understand she's a blessing to you but at the same time you have to train her up to be mindful and mannerable. It starts at home; who's the parent? You or her? I also agree with the other poster who said just start doing it for her and knowing most WANT TO BE INDEPENDENT 2.5 Y/O; she'll say no let me do it.
Now if she's having fits with hitting and screaming; you definitely need to punish her in some way...doesn't have to be physical but timeout in the corner or take away something she really likes...
Like the Nanny 911 show...Parents must FOLLOW THRU WITH PUNISHMENT