New update from NJPefa an hour ago:
BM/13, the falcon missing between Sunday and Friday afternoon, is being evaluated at The Raptor Trust. We know she was being fed by her parents because she's not thin. She'll be x-rayed on Monday to see if there are any injuries.
I am glad she was taken to the Raptor Trust, where her sister is also being cared for. Perhaps at some point they will be able to see or hear each other.
Meantime, BM/18 spent the night just to the right of the nest box, on the ledge. In the morning she went back into the nest. Came out onto the roof for a little while and is currently back in the nest.