Was at the MSU orchid show in MI this past weekend & saw a representative that the plant yours had brought to mind, Gin [just couldn't remember it] ... one of the Gerberara

http://www.montclairorchids.com/images/full/catt_0030.jpg

& since Gerberara Snow Ballet, at least, is a Richard Mueller cross -- (Dial. Snowflake x Bl. Richard Mueller) -- perhaps I wasn't totally off earlier. So whaddaya think Gin, might your mystery plant be a Gerberara?