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Hardcastle was one of 156 British women who publicly supported the aims of the International Congress of Women, held in The Hague in April 1915.
She held a lecture at the International women’s congress in Stockholm (1911) and she was an active participant in the Women’s International League for Peace and Freedom (1915).
Lola then traveled to Europe with forty-seven other women that April for the International Congress of Women at The Hague.