Another can you identify this book?

[Dancergirl]

It's a picture book but for older children ie lots of text on each page. Mine was hardback, quite large in size.

The main character was a little girl called I think 'Little Sister'. There were also characters who were like Greek Gods called January, February etc. The story was something to do with her getting lost in the ice and snow.

That's all I remember! It was probably around 1980.

Any ideas?

I think it's Little Sister and the Month Brothers - not sure if it's still in print but I used to own it. :)