This letter appears to be a form letter (perhaps a petition) addressed to the Pope; as Therese is not called Venerable it must be before 1921, and probably before 1914, when her cause was introduced at Rome. My guess is that this petition to the Pope was necessary for the cause to be introduced at Rome (for that is distinct from, and after, the local church court in France).

 

Form letter to Pope

Form letter to Pope