In the narration of Abdan from Abdullah bin al-Mubarak (may Allah have mercy on him), Sayyidah Aishah (may Allah be pleased with her) said: A tamimah is what is hung before afflictions, and what is hung after afflictions is not a tamimah.
This is more correct.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19607