She initially looks right, however Decelle gives the height as 205mm which would be about 8 inches. does your measurement include the base?
I'm not sure if more than one size of this figure were made. Decelle's Opalescence is the only book I have to hand which includes her. I know Sevres issued plain frosted versions sometime after the war, however, as far as I know they were from the original mould and would therefore have been the same size...
Looking at the example in Decelle again, it does seem there's some difference in mould detail; the creases in the fabric look a little simpler and more vertical on yours, but it's hard to judge from the photos. It also looks like the hair on your figure is simpler and more stylised than on the known Etling version.