My apologies for the oversight. When performing Salat al-Janazah for a deceased woman, you should indeed start with four Takbirs (saying "Allahu Akbar" each time) before reciting Surah Al-Fatihah and making supplications. Here is the corrected guide for performing Salat al-Janazah with the four Takbirs:

1. Make the intention (niyyah) in your heart that you are offering the funeral prayer for the deceased woman.
2. Stand facing the Qiblah, the direction of the Kaaba in Mecca.
3. Raise your hands and say "Allahu Akbar" (Allah is the Greatest) to start the prayer, for the first Takbir.
4. Recite Surah Al-Fatihah silently.
5. After Surah Al-Fatihah, say "Allahu Akbar" for the second Takbir.
6. Recite the following supplication silently:

"Allahumma salli 'ala Muhammadin wa 'ala aali Muhammadin kama sallayta 'ala Ibrahima wa 'ala aali Ibrahima innaka hamidum majeed. Allahumma barik 'ala Muhammadin wa 'ala aali Muhammadin kama barakta 'ala Ibrahima wa 'ala aali Ibrahima innaka hamidum majeed."

7. Say "Allahu Akbar" for the third Takbir and make du'a (supplication) for the deceased woman.
8. Say "Allahu Akbar" for the fourth Takbir and make additional du'a for the deceased woman, asking Allah for forgiveness, mercy, and elevation of her status in the Hereafter.
9. Conclude the prayer by saying "Assalamu 'alaikum wa rahmatullah" turning your head to the right side.

May Allah accept your prayers and grant peace and mercy to the deceased woman.