As always, we can never know what goes on behind the closed doors of a marriage. Yes, Tessy was happy to marry a Prince with no succession rights, but whatever else he lost, he obviously was never at a loss for money to support them and their children and to allow them both to complete their education.
Louis' position in society was assured and Tessy, as his wife gained an entree into a lifestyle few can aspire to. Not surprisingly, for a close family, the marriage was regularised and the title HRH Princess bestowed on Tessy.
However given the announcement that upon her decree nisi she lost her titles it is hard to understand why she would go so far as to list a title that she never had and does not acually exist at all. Makes me reexamine her motives.
Calling herself P de Luxembourg is not creating her brand because she was never Princess de Luxembourg and if it were just branding I would understand if she called herself P de Nassau. But talking to the media having previously given an interview asking for privacy coupled with the whole title deal seems like an attempt to drag in the ex-in-laws.
Yes, Tessy managed three years married to Louis without the title 'Princess" but now she is in the unenviable situation where she is no longer Prince Louis' wife and is also no longer a princess.