Pg. 8 "She felt no concern for the death of young Conrad, except commiseration, and she was not sorry to be delivered from a marriage which had promised her little felicity, either from her destined bridegroom, or from the severe temper of Manfred, who, though had distinguished her by great indulgence, had imprinted her mind with terror, from his causeless rigour to such amiable princesses as Hippolita and Matilda."
If she was not afraid of Manfred, she would have gone to hell rather than marry Conrad. She knew she was not going to be happy marrying Conrad.