Another gentle approach that is working well has been taking toys away. By this I mean if there is something that 2 girls want but they are being unkind, I stop them and kneel down on their level. I reassure them that they may both have a turn...all sounding completely common so far? They say that they understand and will share and then comes the good part... I ask one who should get to play first. If she says, "me!" I give the other child a chance to answer. If both say they should go first, I put the toy away. It is vital that they learn a giving spirit early on in life. Not a "me first" mindset.
This has been working fellow mothers and caregivers!
Olivia came to me just this morning, saying, "Maddy can read that book first and then I will."
I encourage you to try this if you need some gentle options for sharing techniques...