I seem to recall at least 2 medals to nuns being sold at City Coins a few years ago, where the price achieved was about £1300, I don't have the records to hand, but I think £4650 is a little optimistic and I would be very surprised to see it sell at that price. A rare medal indeed, medals to these nuns very rarely come up for sale.
Just checked my records and the QSA to Sister Raphael, also MID and at Bloemfontein sold in October 2018 at City Coins for a R22000 + R3300 for a total of R25300, at the prevailing rate of exchange that was £1405.
Add a nominal annual growth of 10% equates to approx £1900 today.
QSA (0) (NURSING SISTER A.B. HILL.);
KSA (0) (SISTER A B HILL)
QSA , NO BAR TO NURSING SISTER A.B. HILL. KSA , NO BARS SISTER A B HILL. GEORGE VTH ROYAL RED CROSS IN BOX OF ISSUE. GAZETTED 23 FEBRUARY 1917. MISS A.B. HILL MATRON Q.A.I.M.N.S. Res BATH WAR HOSPITAL. NOT ENT 1ST W/WAR MEDALS.