Maria Motessori was a very devout Catholic, but given that the school is run by lay teachers overseen by the sisters, I would bet that otherwise your post is spot on.
If education in the past has been subsidized by cutting corners on maintenance and retirement funds, and the sisters now have a need to wind down the order gracefully, nothing unjust is going on here.
Thanks.
I don’t know about this particular convent, but most nunneries were set up so the younger nuns took care of the older ones, among their other duties, at least until they got very old and needed to be hospitalized.
But the fallout of Vatican 2 resulted in many of the younger nuns leaving, so the older ones, still faithful, had no one to support them or earn money for their care. Plus many of the orders got no new recruits, which also resulted in a rapid increase in their average age.