For those who are interested, this is the (edited) NCAAW case play for the NFHS situation detailed above:
A.R. 65. A5 is fouled during an unsuccessful try for goal. As A5 goes to the free-throw line, A5 is assessed an unsportsmanlike technical foul, which is A5’s fifth and disqualifying foul. The scorer...does not inform the official that A5 has been disqualified until after A5 attempts the free throws.
RULING: Since A5 and A5’s coach were not notified of the disqualification until after A5’s free throws, the result of A5’s free throws shall stand. (Rule 4-12.4, 8-3.2.c, 2-9.4 and 4-27.1.e)