As I told you last time, you should contact the Toulouse archives departement to obtain Mireille LOUSTRIE's death certificate (or rather OUSTRIE ???) in 1922-1923. It's a very quick search, I think you will get an answer. Contact Pascale JACQUELIN who works there from me, she's a very nice lady.
Or there is another way : you could wait till the 6th october, it's the day when the Toulouse archives departement will be on line. You could search in the tables the date of birth of Mireille before 1900.
Good luck !
Sandrine Braun-Espouey email@example.com