Lord, heal and comfort Theodore, his cousin, and all the medical practitioners involved. Grant rest to the soul of her child, and place the child where there is no suffering, sighing, or sorrow.
Miscarrying a child does hurt, and there are special prayers which I would write down right now except that I don't have my Euchologion with me. They will be said sometime today, though; the important thing is for you and your cousin to know that prayers are being said for everyone involved, even the medical folks, since things like this take their spiritual toll.