In China, throwaway cell phones and plans are dirt cheap, relatively speaking. Prayers are good, but level-headed immediate action is required as well.
Why don’t you tell us which country she’s in? I dare say that there are people here on FR with expertise on just about every place in Asia. Some FReepers even live over there. So if you’d be more specific, you might get helpful info.
Also, if any part of her trip was purchased with a major credit card, the loss of the phone may be covered by the card issuer’s “automatic” insurance. So call the card issuer ASAP today and ask what they can do for you.