YOU SAID:
The blue lady is riding its red bike.
INTO JAPANESE
青い女性は赤い自転車に乗っています。
BACK INTO ENGLISH
A blue woman is riding a red bicycle.
INTO JAPANESE
青い女性が赤い自転車に乗っています。
BACK INTO ENGLISH
A blue woman is riding a red bicycle.
That didn't even make that much sense in English.