My DD is 4 and as we say in the west of Scotland, a pure greeter. She will cry if she thinks it will get her out of something she doesn't want to do. We went through it all about a year ago and it settled down, but it's come up again since starting school.
Being very honest, there's a few others who seem to be the same and I think she is being inspired back to old ways. Her teacher is also very young and absolutely lovely, but possibly too lovely?
I have spoken to her, praised her and sanctioned her at home, but I'm worried that at school she is being allowed to get away with it. Today she cried because she didn't want to go to gym, so was allowed to colour, and also because she didn't want to go to out to play- and she was allowed to stay in!