What advice is offered to a woman of weak constitution who used to perform night prayers (Qiyam al-Layl), observe supererogatory prayers (Nawafil), and pray Fajr, but is no longer able to perform acts of worship as she once did due to recent work-related exhaustion?

If physical exhaustion is the cause of languor in worship, then one should not overexert oneself with what prevents the performance of acts of worship. One should suffice with what is bearable of supererogatory acts. As for the obligatory duties (Fara'id), they must never be neglected under any circumstances. Faith increases and decreases, and languor may be due to sins or physical exhaustion. We advise striving against the self to perform the obligatory duties fully and on time, and to perform the regular (Sunnah) prayers. If inability occurs due to fatigue, then the ترك (leaving off) should be from the supererogatory acts, not from the obligatory duties.