Language delay

I joined this forum today. Our 4-year-old daughter (now in junior kindergarten) has just tested as having receptive and spoken language skills that are more than a year behind her calendar age. We adopted her from an orphanage at 14 months and she was in very rough shape at the time (slightly heavier than a newborn, couldn't roll over). We've seen steady physical and other developmental progress, seemingly moving ahead at "fast forward", and were not too concerned, but we now are worried. We would like to start intensive intervention which hopefully will bear some results before she starts grade 1. We'd greatly appreciate any relevant experience you'd care to share. We have just barely received this news, still waiting for the written report, and haven't yet progressed to planning treatment.