Yes she will get very agressive.
She should have her babies sometime next week.
Make sure Butters isnt in the same cage as her though because it can aggitate her alot and make her hold the babies in. Also he WILL kill the babies.She should be in a quiet secluded place.
Dont be surprised if she dosent use the nest box too, not every bunny dose. Just be sure to put them in there once they are born.
Pm me if you have any questions I have unfortunatly been through this
for the same reason as you.