Repot with care, it's worth looking it up on the net - they don't want hardly any soil, they grow better if they are rootbound. Better to use a heavy pot the same size as the one you have, and stake the flower.
I was hoping someone would be able to tell you sandy10. Mine is rootbound I think, in a very small pot and I can't see any soil, but it has flowered again this year much to my amazement.