Can I get arrested? Please help!?

[Sandy]

There's this girl I know that smokes a lot of weed, as well a other things such as takes cocaine etc, well this girl has just started working in a job I got rejected from. I'm really cross because she's rubbing my face in it and only applied after I told her I was really hoping I would get the job because money is so tight. So my question is, what if I make a few anonymous complaints about her to the boss, pretending that I was a customer she was rude too? Also, her Facebook page has loads of pics of her smoking weed and frequent references to taking drugs, can I anonymously email her employer asking if he knows he has hired a drug addict and maybe send him a link to her profile? Is any of this legal? If she finds out its me can I be arrested?