I'm not sure her defence of "I was supplied real bullets instead of fake ones and didn't know the difference" shows her in a positive light for her technical abilities to be blunt. Of the three folks directly involved, I think she's the only one that stands some actual risk of jail time, so I'd hope her defence case is better than what is effectively a plea of "I don't know what I'm doing so its not my fault, its someone else's for supplying me real bullets in the first place".
For clarity - "dummy" bullets used in filming by most US studios, which are meant to look identical to real bullets, will have all the gunpowder/propellant removed and the primer (which contains a little charge to ignite the gunpowder) is also replaced with an empty version for safety, whilst real bullets still contain those two parts. This makes real Long Colt .45 bullets weigh about about 2.5g to 4g more (easy 3 second check with some scales), they usually (but not always) sound different when shaken (gunpowder is loose in some bullets and sounds like sand in a tin) & they're usually marked in some "not obvious to the audience" way by the professional company which sells them.
All these things generally make it easy for a professional armourer to tell the difference between a dummy and a real bullet and therefore prevent lethal errors from happening.