I know what she did, it's just bizarre. Also, it's ironic, since she's compounding the issue with the problem itself; she herself is poorly notating as well, changing the meaning and answer.

Edit: Or maybe it isn't the wrong order of operations, going by what some other commenters are saying. I like the notion that this is a language problem, not a math problem.

Yeah, it is fascinating. Funny thing is, I think she's actually more on the right path than the "correct" answer...she just unfortunately fucks up on really basic things along the way, leading to a completely wrong answer.