Hay, I'm so sorry about your friend, that's really heartbreaking. After a miscarriage, she should definitely see her OB right away para ma-check kung kumpleto na ang lahat at walang complications, kasi ito talaga ay medical na kailangan ng expert guidance, hindi lang home remedies. Pero from what I know from mum friends na dumaan dito, usually they're advised to rest, avoid strenuous activities, be gentle with themselves emotionally, and follow whatever ang doctor says about bleeding or infection signs, but honestly, every case is different, so better na makipag-usap sila directly sa kanilang doctor para sa proper recovery plan. Sending strength sa inyong kaibigan.