The quoted part of the newspaper article had a note saying (as in the original).
Most common modern spelling; uses katakana ママ for clarity.
Hiragana variant; also widely seen.
Kanji 儘 is archaic and rarely used in modern writing.
From 原文 (original text) + まま (as it is). The katakana ママ is often used for emphasis or clarity in this fixed expression.