about Irina's title i can say one thing.
she was not a Grand duchess. According to the old rule Grad Duke (Duchess) is a son, grandson of the ruling emperor, if i'm not mistaken. Then they had some restrictions on it at the end of the 19 century.
Irina was a daughter of Sandro, grand duke Alexander Mikhailovich (the son of g.d Mikhail, grandson of the emperor Nicolas I) and g.d Xenia (daughter of the emperor Alexander III). But in Russia all the titles are inherited to male line.
that's why Irina is not a Grand Duchess, she is THE PRINCESS OF THE BLOOD, in Russia we say The Princess of the Imperial Blood.
After the marrige she lost all the ruling rights and the name, her title was Princess Yusupova.