A fifteen footer ! Thats a sativa for sure. If it tipped over and ripped some roots up then use poles and ties to tie her up and recompact the soil, burying all exposed roots. If anything has snapped then you need to make splints and tape the splint to the broken branch(s). Tip : Bend the meristem over and using a length of cord, make it so that the top presents an angle of 90 deg. to the sun. That way your plant is less conspicuous and the buds will grow vertically from the bent-over top. It will also be less susceptible to wind/storms this way.