You were essentially asking two questions.
1) Why did Lena apply for citizenship if her husband had naturalized prior to September 1922?
Marian gave you a great answer.
2) What were the meaning of the dates at the bottom of her petition?
It looks like those were the dates from when Witness 1 and Witness 2 knew Lena.
1st wit: January 1, 1906 Rose Wanshel knew Lena from 1906.
2nd wit: January 1, 1929 Irving Aaronson knew her from 1929.
Risa Daitzman Heywood