I honestly think something has happened along the way and Tessy had changed in some way. We never saw behaviour like this before. She was well respected by most Lux RF followers for doing more than was expected of her in terms of charity work, public duties etc. Personally I think she allowed it to go to her head, she wanted more and believes she can be some headline grabbing, humanitarian saving the word singly handedly with the adulation that would entail. In some ways I can see why, even as a relatively minor royal she got a taste of what it was like to be "important" - the crowds, the followers, the dresses, the jewels, access to learning and education, visiting the UN and meeting important people, the positive headlines and of course some people will always want more. I think she did and realised Louis wasn't like that and wouldn't want the same and with his two older brothers marrying she was slipping further and further down in importance, maybe she was even asked to dial back her duties so as not to show up the Hereditary Grand Duchess. She saw what she wanted and has gone for it, above all else, Tessy wants the glory and fame and that is her weakness.