Oh my God, I could have written this myself! I work in a small team of 3 consisting of myself, Negative Lady and our line manager.
I find it SO draining. She is constantly moaning about EVERYTHING.
Usually her lack of money. A few examples...
I eat my lunch at my desk and she moans constantly that she is starving. I usually say "oh why don't you go and get something for lunch", the answer is always that she can't afford it. It's rained the last two days, she has complained that her house leaks, yet she cannot afford to get it fixed. Yet she gets her nails done and smokes 20 a day! I find it very hard to bite my tongue.
She genuinely does not have a good word to say about anything. She was stood right next to my desk the other week with 2 colleagues, they were just moaning about everything and anything (I find that it's probably quite contagious) - I said loudly (in front of my boss) "OMG come on guys, it's all just moan moan moan, it's Friday afternoon, cheer up, it's draining!!!". They all looked quite shocked, Negative Lady glared at me, the other two laughed, apologised and walked off. I just rolled my eyes at my boss.
Later in the day I brought it up with my boss and just said I find it SO hard to be around her. I go home and find myself in a bad mood because of her constant moaning about everything. He agreed!
Now I just combat her whinging with happy, smug tales of my own. If she says she is poor, I say "yeah I would really struggle if I didn't have two jobs... life is what you make it hey!!". If she says she is hungry "yep, I would be if I didn't eat lunch too!!". It's the ONLY way to combat it.
Don't let her bring you down. Massive sympathies, I feel your pain!!