I find that sensory input is a major thing for our kids. What worked for my son was to tell him that its normal but he can only do it in his room and in privacy. Our kids already have so much social anxiety. We can only do our best to conform them. She probably only does it at school to comfort herself. School is extremely overwhelming. Always remember to be kind and do your best to talk to them at explaining things. Our kids understand a lot more than they let us think. I find that my son does all sorts of strange things when he is overwhelmed.
My recommendation is, let her self regulate when she is in her room and work with her OT on sensory intergration. You will soon see that she will find an appropriate way to sooth and regulate herself.
At school ask them what triggers it and to not say anything to her but move her arm away and give her something else to do like a prefered activity. Kind redirection is always the best way to go at these things.

Thanks @A MyAutismTeam Member. I try to research but limited stuff is around my city. Now my daughter refuse to go to school. This was the worst tantrum I ever seen her in. I had to drop her off of daycare cause it’s the only place she feel fine

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A MyAutis...

They told you she was "fingering herself"? I would say get an attorney but you have other things to worry about now. Really good sensory OTs are hard to find. Research research. You will find someone. have you tried a sensory diet? There are many blogs and videos about it. Try a sensory diet before sending her to school. Also if she is non verbal, she can get a :1:1 therapist at school. That will give you more information of what triggers the sensory need.

I dont know what to do. Teachers are telling me she is just fingering herself but she doesn't do it at home at all. Now the calls are coming in more often. How can I get her into sensory therapy?

I had similar issues with my 4 year old, I would have to keep telling her at home that it's not ok and tell her no every time she did it. As far as her doing it at the school I recommend asking the teacher to do the same. Most kids explore and get curious at an earlier age so I've been told it's normal and just 1 of those development delays and she'll hopefully grow out of it.