Personally, I hate expressing so I would say that's enough Make sure you store the milk in 50ml batches as she may not drink very much at a time and it saves the carer throwing away excess milk.
I'd suggest getting her brought to you for at least one feed in that time - it's a long time to go without a proper feed, especially if she decides not to take the bottle and needs to be cup or spoon fed.
Make sure you take the pump with you for your own comfort too!