I am sorry, the only thing I have found is this... maybe it would be worth to ask there whether they have any pics, since some people posted unpublished photos of the Grand Duchess, they might even have the funeral photos.
Want to bump this thread again in the hopes that someone out there has pictures of the golden rose!
Here's the picture of the golden rose given to Grand Duchess Charlotte by the Pope. The rose is part of an exhibit of the Grand Ducal family's silver possessions that will be on display at the Musee National d’Histoire et d’Art from October 5 to January 13.