Did she draw the design herself?
If not, did she *lie* when asked if the design was her own work?
Every other circumstance listed is nothing but excuse-making, and has nothing to do with whether or not she violated the honor code.
We had an honor code in art school too, but that didn't stop the administration from listening to a bunch of excuses and then giving a pass to a student who stole my friend's graphics portfolio and turned it in as her own.
If you're not going to enforce the rules, just go ahead and declare that the rules are meaningless.