Let her husband disgrace her, let Vronsky grow cold toward her and continue to live his own independent life (again she thought of him with bitterness and reproach), she could not give up her son: She had an aim in life and must act so as to ensure her position toward her son, while they had not yet taken him from her.
Пускай муж опозорит и выгонит ее, пускай Вронский охладеет к ней и продолжает вести свою независимую жизнь (она опять с желчью и упреком подумала о нем), она не может оставить сына. У ней есть цель жизни.