YOU SAID:

My mom used to buy me flowers

INTO JAPANESE

私の母は私に花を買っていました

BACK INTO ENGLISH

My mother was buying me flowers

INTO JAPANESE

母は私に花を買ってくれました

BACK INTO ENGLISH

My mother bought me a flower

INTO JAPANESE

母が私に花を買ってくれた

BACK INTO ENGLISH

My mother bought me a flower