Productivity Jealousy

I've noticed a level of jealously between the post-docs in my lab (actually two) and it's funny but annoying at the same time. PD1 has been in the lab for almost 3 years, PD2 (with whom I'm on the paper that is officially ACCEPTED) has been in the lab for almost two years.

PD1 smooches off other people, talks her way out of everything, is lazy, makes herself seem intelligent, had a baby (I'm not against this) @ start of the year (thus took time off and since then takes random days off and usually does half days), complains alot and loves to gossip. No posters (well one but it was someone's work who left the lab and she inherited the project, all she added was one pic of a fish model-that was not even made by her) and no papers (from our lab or via collaborations). PI told her she has less than a year due to no productivity. Hasn't given a substantial lab talk in over a year and a half, she always seems to avoid showing her results. Passed on a request from PI to write a review for a journal he is currently editor of, now she's mad at another PD who PI asked. Her excuse and please, this is exactly what she said "I'm too busy with my baby so ask someone else" and she didn't even say it nicely, she seemed annoyed.

PD2 is a hard worker, although I didn't like her in the beginning she's proven herself worthy of my respect, she was the one PI gave my project to, is loud (high voice), stays in her bay, doesn't openly gossip, is nice and helpful. She's been to a couple of conferences, has a paper from our lab (good journal- first from our lab in a long time) and via collaborators. Doesn't really take time off , just regular vacation like everyone else because she's always in lab. PI wants to keep her. Has been gone since last week.

Yesterday PD2 talking to Asst. Prof

PD2: PD1 is still on vacation, I think that's too long, she shouldn't be gone that long.

AP: giggling.... I know

What was that, this woman does practically no work at all so much so PI had to give her an ultimatum and she had the nerve to say that. I was offended for PD2 because she's such a hard worker but I held it in because it was not my place to say anything.