IMDB:
http://www.imdb.com/title/tt0458455/
Summary:
A 9th century woman of English extraction born in the German city of Ingelheim disguises herself as a
man and rises through the Vatican ranks.
Starring Lotte Flack as the teen version of the protagonist.

(She's in the first 30 minutes of the movie.)
(Sorry, I couldn't figure out how to post screencaps!)

Pics from other sites:
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The link:

Enjoy!