Hello, Welcome to the board. Please post pics of the vase and some pics of the signature also. Closeup shots of details on the vase would be helpful also. As there are a couple of variations of vases named LaDanse. There is LaDanse - Gaite, and also LaDanse. The appearance of these two are quite different from each other. Also, could you please provide accurate measurements, as the ones you estimated do not match dimensions I found for either style of LaDanse.
Glad to help, but better info is needed.
Craig