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I can tell you this from personal experience. I have a friend who owns a Mac10, (or something like that) that was sold to him as a semi-automatic 9mm by a reputable gun shop, (one that I myself shop in) and the only thing he had to do was to put a penny inside, (in the right place) and the gun would empty the 30 round clip with a single pull of the trigger.
I've fired MILLIONS of rounds out of thousands of weapons over this time.
I don't believe a word you just said knowing full well how the internal components and cycling of a Mac-10 functions.
Also the Mac -10 is fed by a MAGAZINE. Not a clip.
Someone was either pulling your leg or you're lying. Secondly Mac -10 SMGs have select fire options. This would probably explain why you could fire it in both semi- and auto mode.
Lastly reputable FFLs can sell select fire weapons and machine guns provided they were manufactured before the ban in 1986, the seller has the proper licensing for it, and the buyer has to jump through all kinds of NFA hoops and pay HUGE taxes and prices.
According to gun enthusiasts, she could have done this with a knife, or a baseball bat.