Yes the behaviour will normally escalate before it disappears (called an extinction burst) - just like with any child! She's not used to this (having to comply with a request) so is expressing her disgust in the best way she knows how. Honestly, it will get so much better. As everyone has said, once she has been shown that there is a better, more effective way of communicating with you, she will use this, rather than tantrums.
Our consultant told us of the 20-knocks rule:
You see a door. You want to go in. You knock. No-one answers. You knock again. Nobody answers. You knock again. Nobody answers. You keep knocking 20 times and then finally someone answers. So you know that eventually, it doesn't matter how long you knock, someone will eventually give in and answer. So next time you see that door, you will keep using the same strategy (knocking) that you did before, as you know it was successful in getting what you want.
However: you see a door. You knock. Nobody answers. You knock again and again and again and again and again, over 20 times, 100 times, 1000 times but nobody answers. You eventually give up as you realise no matter how long you knock for, nobody will answer. So you realise that you have to change your tactics to get in, that it doesn't matter how long you knock, that door will not be answered.
The thing is that you, the parent, have to be consistent. If you start ignoring a 'behaviour' you must keep ignoring it. If you ignore it for 10 minutes then give in, the child learns that they just have to keep on tantrumming and you'll eventually give in. Or if you ask the child to do something and she tantrums, she must learn that the tantrum itself will not stop you asking her to do the thing.
Basic message for her is that a tantrum/aggression is not a form of communication that will get her what she wants.
Talk to your supervisor/tutors more about this if you need help - that's what you're paying them for!