Princess Stephanie has also not been married
nearly as long as any of her counterparts. How can she have reasonably accomplished as much as Mary, Letizia, Maxima...every one of them has had 10+ years to take the Royal world by storm whatever that even means. It's frankly absurd to compare the accomplishments of someone who has been married a couple of years to someone who has had over a DECADE to make her mark.
By all accounts, the citizens of the Grand Duchy are very proud of Stephanie according to a documentary that was produced about her in Luxembourg in June 2013. She picked up their difficult dialect in an amazingly short time. She has attracted none of the adverse publicity in Luxembourg that Mary and Kate have received due to clothes spending and excess holidays. Until she became queen last year Letizia seemed to struggle with her image and her press and had not taken even Spain by storm, let alone the entire Royal world.
If you are referring to public engagements she has attended, last year Luxarazzi listed data detailing first public appearances for each woman-commoner and noble who had married into a Royal family.
Luxarazzi : Stéphanie's First Solo Engagement
Less than a month after her wedding she accompanied Guillaume to the People's Republic of China on an economic mission, and her first solo engagement was roughly about the same point as when Letizia of Spain made hers...two years after marriage.
Especially when you take into account the size and population of the Grand Duchy in comparison to Denmark and the others and the fact that Luxembourg is a prosperous, small country with very few of the social and economic problems of the others, Stephanie's workload since her marriage has been more than adequate.(And for the record, she has more than one patronage as the information I gave you confirmed.)
As for the fact that she is childless, I am a woman whose inability to bear a biological child of my own has been one of the great heartaches of my life. I am not about to reproach Stephanie or ANY woman for that. Hopefully her situation will not be the same of mine.
As for learning languages? No it's
not hard if you've had years and years and access to the best resources and instructors! Unless she has a learning disability there is no excuse for Charlene not being very fluent in French at this point but at least Charlene at least UNDERSTANDS French even if she can't hold a conversation.
What does the fact that Kate may never be princess of Wales have to do with her not taking the initiative to learn Welsh? Or Spanish or French? She is the only Royal princess in Europe besides Charlene who is not at least bi-lingual. Considering the education Kate was given and her position as future queen, that implies either lack of motivation or indifference, or a combination of the two.
Stephanie might not be better than her peers at this very early point in her public career, but she is certainly not worse than any of them either.