Ok I cant fucken stand it anymore, this has been building up

I have a co-worker who is completely useless; when I first started working here she was the person that was suppose to train me, I ended up training her, a few months went by and we had a change of owners, the new owners fired about half the staff including my useless co-worker, they kept me because they loved my work ethic, my supervisor just so happened to be my useless co-workers best friend, so my supervisor hired her back in a different department, after a week of working my useless co-work fell behind in her work and my supervisor being her dildo buddy ask me to relieve her of some of her work, so now I was forced to do this useless cunts job, 2 months went by and the department the useless cunt was working was closed down, leaving her again without a job, but again my supervisor being captain save a hoe, re-hired her to my department, on top of that she took my time slot, of 8-5 not only that I was forced to work from 9-6, so I had to have a meeting with my supervisor.

In the meeting my supervisor tells me that the reason why she is giving me the new time slot is because my useless co-worker has a special needs kid that has down syndrome, and my co-worker needed the time slot I fucken put up with anyways, I later found out that my supervisor and this useless cunt used to both be meth addicts and this useless cunt smoked meth while pregnant thats why she has a daughter with down syndrome, so why do I have to change my work habits due to this stupid bitch being a worthless person, ohh yeah my supervisor is best friends with her.

I wouldnt mind if she at least knew what the fuck, she was doing, but she doesnt she cant troubleshoot if her life depended on it, its her job to do this, customer calls in states their services is down, you follow protocol, find out what services is down, look at the solutions we offer, verify power on equipment, you think she does this no! She fucken escalates the issue to another person because she doesnt know what the fuck she is doing, it looks bad when my department is lacking in the work ethic because of a single person, and I have tried countless times to help this twat, I have made so many word documents on how to properly troubleshoot every situation from DSL issues to T1 engineering, how to troubleshoot network connectivity and I have given her copies so she can study them and learn,

So am I the asshole for not given two shit about her, I dont care if she was stupid and smoked shit and made her kid retarded. I dont care if she is having emotional issues at home with a sick father that is personal you should never bring personal matters to work, do your job and do it well if you dont know how to do it leave or learn how to,