Hi, Karen,
lovely sonnet,well controlled. There are a couple of places where I need a little help.
QUOTE
where sixty-years ago, inside those white
washed plaster walls your faith was found. Shade spills
The 'white washed plaster' image applied to faith invokes the 'white-washed sepulchres' of the gospels, a very negative description which I doubt you intended. If you did, of course, it is very effective; if this was not your intention, could I suggest replacing 'faith was' with 'faults were' to keep the alliteration and stay in the general area invoked.
QUOTE
to capture every yesteryear you've owned,
leaves me undone. The dormitory stairs
In these lines it's the switch from 'you've' to 'me' that threw me a little. Are you addressing the building or the young girl you were when you attended? Or perhaps a bit of both? Not sure, the later lines on dreams and prayers don't really help me with that understanding, but perhaps that's not too important; the language use is beautiful and more than compensates for a little confusion.
Jim