The "Countess" (or, lady in waiting) is wearing a tall hat called a henin. This was typical for a lady of a royal house. However, a Playmobil princess would have been wearing a smaller crown (or tiara) similar to the one the Queen in set 3263A is wearing. As you can see in this set, there are two ladies in waiting with the Queen ...
Hi Richard may I petition what your source hails from?
Specificly: what do you mean by "typical for a lady of a royal house"?
My sourcebook on medieval fashion mentions this as a 14th century fashion among the upperclass rather than a raiment worn solely by daughters of the reigning family.
I am under the impression there wasn't a "uniform" for royalty--the royal family just wore better and more expensive. French and English "Princesses" could be fashion trendsetters, but didn't have a set of clothing that marked them separately from other upper class women.
-Tim