i feel sorry for someone

I did not write anything in recent days.I was a bit busy and fine it hard to do anything else except sleeping.
Recently, the situation in our work place look like cold war.There was some tension between us.2 against 3-4.one in middle zone.
I don't know what is wrong with the whole setting.
It is true that we don't want to mix with them.But it was becoming more and more complicated.Too complicated that now we are not speaking with each other.
We feel she was jealous of me. But no way to comfirm that.
Today, while me and my friend are making fun, she was at aside, watching us laughing.I feel undescrible sadness since then.
I can't understand what is going on.She likes to get attention that is true.She works seriously, that is true too.
But she can't get the result she wanted. So she is upset.may be it is what make her very aggressive in these days.
I don't know, i was lucky, i went along fine whereever i went, but may be some people aren't as lucky as i am, May be it would make them bitter.
Strangely, i feel sorry for her today.