For sure follow this advice of documenting everything. Made this mistake when I was young. Worked for a charity and got along fine with everyone. Good coworker leaves and largebarge begins. Had to train her and her only response to training was "Sure, whatever, okay..." which should have been a warning. I followed her shift and for months I had to complete her unfinished work. Clean up the workspace, wrappers and food containers everywhere. Clean general area, organize filling, dump garbages that were overflowing, etc... The entire time I try to be polite. I try to assist her and ask if she requires additional training as her reports were never completed. Mentioned it several times to my manager who was an obese woman herself. Always told she is new it will come together.  Finally walk in and the place is a mess, no reports or work done and she wants to leave early. I tell her that I have had enough and will be formerly filling a complaint. My girl was there and witnessed no abuse towards her just frustration of having to do my job and hers. She starts crying saying it is not her fault, life and condishuns. Go in to work the next day and told that I am dismissed and given 2 weeks severance for causing emotional distress. I do have to point out I was the only male that worked there and this also entailed that I act as security, did the hard cleaning and had to physically move the clients. None of which was in my job description but healthy male needs to carry the butterbeasts. Fuck that place. Still bitter.