Hello, fasting for 24 hours and drinking little water can certainly cause weakness, tiredness and heartburn after a spicy meal, so those parts may well be explained. However, a dragging or painful feeling confined to one side (left hand and leg) should not be put down to dehydration without an examination. I would advise getting her checked in person today, rather than waiting.
Next Steps
Please go to an emergency department immediately if she has any of these: weakness or numbness that is still present, a drooping face, slurred speech, confusion, severe headache, loss of vision, or difficulty walking. Meanwhile, give her water or ORS in sips and a light meal. I can help you decide how urgent this is through a teleconsultation on Practo, though she will need a physical examination too. – Dr Amandeep Aggarwal, Family Physician, Sangrur