Crying

I am never really sure what to do when another girl is crying. I figure this bodes ill for people who are not girls at all but have been known to be near crying girls. I do know what not to do based on my experience as a crier.
1) Unless you know the crying girl really well (think relative or very close friends) or there is nobody else around, don't do anything. There is nothing more distressing to a girl then a complete stranger asking her why she is crying.
2) Don't ask why she is crying. This means she MAY try to tell you before she has stopped crying sufficiently to make sense.
3) Don't suggest she doesn't cry in any way shape or form. The moment she tries to stop crying, she cries harder and longer.
4) Make yourself available to offer a hug but don't just jump right in before she is ready. She may not be a huggy person and it may make it worse. Sitting beside is often enough and then if she wants she can initiate the hug.
5) When she has calmed down enough to tell you why she is hurting or angry, don't tell her she is "being silly/she imagined it/that person wouldn't do that/they probably didn't mean to", she knows that and doesn't want to hear it from you.
6) Don't allow it to turn into a gossip session, that won't help you or her. Allow her to vent, that is healthy. Joining in about how horrible such-and-such is, is not helpful.

Here are somethings you can do with anyone and not go far wrong.
1) If you see tears arriving and you are in a position to do so, ask them if they want to go for a walk so you can remove them from the group.
2) Stand or sit quietly nearby while they cry. Don't say anything "helpful", they will appreciate the silent company and the lack of pressure.
3) If they apologize for crying, tell them it is ok to cry and then let them get on with it.
4) When they are ready, usually after sitting quietly for some time, though sometimes they will attempt an explanation during the tears, they may choose to tell you why they are upset. Chances are you will already know, however listening is a good plan.
5) When she has talked and cried and used many tissues, taking her to a bathroom to wash her face is a good plan. Then staying with her till she feels better before rejoining the group.
6) If you see someone go out on their own, allow them to have a private cry before going to join them, or waiting til they come back before asking to see if she is ok. She will appreciate somebody noticing, though maybe not the whole group.