I would definitely contact the University - they will have records.
Different universities granted graduation status to women at different times.
The other confounding factor is that for some time, only Oxford, Cambridge & London could award degrees (to anyone!) so some of the Universities used London exams.
I know this because the Honours Board at school (all girls) had only London for many years, then Oxford, then Cambridge and other Universities, and we were told about the complicated history of awarding degrees.
Some of our teachers who were at university in the 20s/30s were at other Universities, but London awarded their degrees.
I think (not certain that London & Manchester treated women equally from their inception, but would be interested to hear.