We expect a child of 19 months to defend her new-found autonomy, and since she is not likely to have great command of oral language, she chooses the language of action. That doesn't mean we just let her go on hitting, pushing, or hair pulling. Recognize that self-interest, rather than politeness, comes naturally. Only gradually, after patient and consistent limit setting, will young children redirect their aggression safely and appropriately. Along with making your behavioral expectations clear for children of all ages, offer many opportunities to express feelings, including anger, in acceptable ways.
Pretend play with toys and dolls is a fine vehicle even for children who are quite verbal.
It would help for you not to appear alarmed by any sort of pretend-play content, but to join in the play, with the child as director. I wonder why. Some anger will be dissipated if the child senses that you understand and accept her feelings while knowing you won't allow harmful behavior to people or property. Some children need several warnings, so start half an hour ahead. If you yell frequently or are out of control yourself, though, it will lose its value.