So, I'm a staff nurse and last night one of my nursing assistants asked me if I could give them a job reference. The problem is she's not good. At all. She regularly turns up late, she always checking her phone, and another colleague recently complained that she was smoking in the staff room (obviously not allowed). I regularly get people complaining to me that she's lazy and doesn't pull her weight. I tried to side-step the reference issue by saying maybe it would be better if she asked a manager but she said she wants me to do it as I've worked with her for longer (this is only sort of true, as I worked with her briefly about 4 years ago, and then we worked in difference places for about 3 years until she started working where I now work a few months ago). What the hell am I going to write on this reference when I get asked? I know I'm not supposed to write anything negative but I'm going to struggle to write a glowing one. Anyone been in this position before and have any tips?