Occasional aggressive behaviors in a toddler who has not developed good language skills yet can be normal and stemming from frustration. However, if it escalates, you should seek help of your regula health care provider.
She is obviously frustrated and trying to get their attention. Try and get a speech and language evalutaion on her. In the meantime you need to tell her "no" when she exhibits behaviors you do not want. Be firm and consistent. It's more difficult when they are younger and their language development is not that of school aged children.
lol i had the same problem with my daughter when she was two i managed to stop he by bitting and scratching her like she does to other children. it may sounds mean but it teaches her that if she don't want it done to her not to do it to others