Beryl Swain was the 1st female driver to race the TT,I believe regulations previously did not allow,but was not the first female competitor.
Not sure but I believe I read somewhere recently that she is living in retirement in Essex.
There were in the 60s several accomplished female racers, Two which come to mind,having raced with them are Pat Wise,manx Nortons,she would have given Maria a run for her money, and Margo Pearson, Montesa,who could hold her own in the 125 class.