Imam Sha'bi (may Allah have mercy on him) said: That woman will perform ghusl (ritual bath).
Hadith Referenceسنن دارمي / من كتاب الطهارة / 1006
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده ضعيف حديث محمد بن سالم لا يسوى شيئا، [مكتبه الشامله نمبر: 1010]
Hadith Takhrijاس قول کی سند ضعیف ہے۔
Brief Explanation
(Commentary on Ahadith 998 to 1006) These are the ijtihads (independent juristic reasoning) of the esteemed Imams. Most have said that a woman who experiences menstruation (hayd) after intercourse (jima‘) will perform the ritual bath of janabah (ghusl al-janabah). And this is better. And Allah knows best.