My son was like that at 2. I sent him to time out in his room one day and he actually took the sheets off his bed and pulled all his clothes out of his closet all while screaming like an animal. We just thought he had a horrible temper! But now knowing he has SPD it explains sooo much. His meltdowns arn't nearly as explosive now as he knows not to tear his bed and closet apart. But I actually try and hold him and wrap him in a weighted blanket. sometimes rocking him will help. I try my best to remove him from whatever enviroment he was in when the meltdown started. I try to make him know that I know he's upset and its okay to be upset but I try talking him down. He has a hard time calming himself back down. I'm still new to all this and everything is trial and error at this point and sometimes this doesn't always work I hope you find out what works for her.