I want to wreck my daughter's ipad
Why would you want to break her iPad?
I want to punish her for throwing a tantrum when she doesn't get what she wants
Wanting to punish your daughter for throwing tantrums is understandable but you shouldn't break the iPad. That doesn't really serve a purpose and it would be throwing away good money. Instead you should just take the iPad away and tell her she can have it back when she stops.
I can't do that, she is going to throw a tantrum and she will be upset.
It seems she's going to throw a tantrum either way. It's better to just let her have her temper tantrum than to break something you've paid for.