Who Cares? I Know I Don't.

We've all known one. The person who's constantly complaining. Either about their general health or place in life, or about other people- "He did this" She didn't do that" etc. They like to point out the shortcomings of others, whether fact or fiction. Never to the face of the those people though, to everyone but. They like to make sure everyone else knows that they're doing what they are supposed to be doing, and let everyone know they're always going that "extra mile", patting themselves on the back and hoping to get a pat from you. They spread negativity and drama like fairydust, leaving those affected by their misery (not me, by the way) feeling depressed and/or rejected.
I work with one, have for the past 2 years or so. I wanted them to fire her 2 weeks after she started. She used to work in my area, and I got her demoted to another one. She keeps trying to get back in my area- not as long as I'm there and have a pulse. She's shaped like a pear, she has tattoos and what I refer to as "lesions" on her chest, that you can see with the tops she wears. She drinks 50 gallons of coffee daily, she smokes like a chimney, she wears tank tops to work meetings that say "Got tequila?" . She asks people to borrow money (I am the only person she hasn't asked), she will be someone's friend and talk smack about them behind their back, she will ask for more hours and complain about money and then complain that she has to work so much. She has a boyfriend who does not work and weighs roughly 400 lbs. He used to try to get my boss to hire him for odd jobs around the business. You could always smell him immediately upon entering- a mixture of old food/grease, BO, and cigarette smoke. Because I'm so mature, I would stand behind the boyfriend, holding my nose and acting like I'm vomiting, so my boss had to struggle not to laugh.
She lives in an apt next to work (how convenient) with this boyfriend, his PARENTS (also not working) and about 20 pets. Apparently his dad has diabetes he doesn't control, and she often complains about his "oozing sores" on his legs. Between the animals, the dad, and the stinky buffoon, can you imagine what that place smells like? She brought blueberries in today that she "picked"!!!??? I declined to eat them, explaining to my other co-workers that she probably fertilized the plants with festering wound goo.
I know some people may be reading this and feel bad for her, or them- don't. They are terrible. Always looking for a handout, and blaming outside forces for their problems. They will not help themselves, and they never appreciate it when someone else helps.
At the same time, I do realize I have choices, and they don't recognize they've made any. They think they're who and where they are, and that's it. I was raised properly, I guess they weren't. I get it, and they don't. I will always be happy (with the normal bouts of sadness/feeling overwhelmed) and they will always be miserable.
I still hate her though.