Kindergartner Hitting

I would try to see if they could figure out WHY she is hitting. It probably isn't b/c Suzy took her juice box or whatever. There is quite often some other source of anger or fear? Maybe she is nervous in school, or scared b/c she doesn't understand something etc.
Also she needs help understanding the idea that these behaviors (hitting etc.) hurt other people and it makes them sad etc. When I had students like this who had a chronic problem with hitting I would ask a question like"Who you like it if so and so hit you?" And they might say "But they took my crayon." meaning they totally don't get it. There is a disconnect that their behaviors directly effect others. I would try to just ask her lots of questions..."Why did you hit?" What did you feel when you wanted to hit? Oh they took your crayon? Oh how did that make you feel? all in super calm words etc. and then well we can use our words and say "That hurts my feelings, or I am frustrated with you or whatever
This is a longer pattern of behavioral change. Obviously she has to and will be punished for hurting others but you've gotta dig a little deeper....good luck!

Try giving her a visible "magic" bracelet that will remind her not to hit! Sometimes a visual reminder works.

I can relate...maybe instead of grounding her or taking this away you can try to explain to her that hitting is not ok. It hurts people. Hands are so clapping or writing etc. Teach her other things to do with her hands. My son had the same problem in preschool. His teacher gave him a small stuffed animal and he had to hold on to it during circle time so he wouldnt hit others. It worked. Now he is in kinder & the 1st day of school he kicked his teacher & hit friends. I was not happy. So I told him that he could not behave that way & that was the last time I heard of such behavior at school. At home he still tries to hit his brother so I have consequences for that. Good luck

I suggest that the hitting is fueled by anger and taking away privileges and grounding her only adds to her anger.

I suggest reading the book How to Talk with Kids so that They'll Listen and how to Listen So they will Talk by Adele Faber and Elaine Mazlisch so that you can learn about why she's angry and get ideas of how to help her express her anger with words instead of hitting.

Model using words when she's angry. Perhaps role play situations that she's had at school. Ask the teacher for suggestions on how to help her. If the school has a counselor make an appointment to talk with her.

I suggest this is a situation for teaching rather than punishment. It's a time to be empathetic with her, to listen to her as she expresses her anger and then later to show her ways to handle that anger.

I'm not saying not to discipline her. I'm saying to be sure the discipline teaches her how to handle her anger.

She needs to be treated with respect withing a loving happy home AND be given consequences firm enough to deter her from hitting again. Sounds like she's not really worried about the outcome of acting aggressively toward others.
Back to Basics Discipline by Janet Campbell Matson. My 5 year old daughter would not dream of trying that (nor her two younger sibs), and she was raised with this method.

The best thing I have to offer for advice is the kids in my class who are still a ways off from Kindergarten respond the BEST to praise. I get better results from praising good behavior than I do from any other form of punishment.
I liked the mom suggestion for the bracelet = )