You might be wrong because the Ashes series is not played between India Women's team and Australia Women's team. The series is held between the England Women's team and the Australia Women's team, and the same for the men. That is, in the case of men's team, Australia and England cricket teams participate in the Men's ashes Series. You mentioned that the Indian women's team is very strong, it's true but they can't put up a strong performance against Australia.
Maybe we saw a series before that they performed very badly against Australia and they lost against Australia in that series. The Ashes series between Australia women's team and England women's team will start from next 12th.
Is there an equivalent series in women's cricket? For Ashes (ENG vs AUS), the equivalent series is Border-Gavaskar Trophy (AUS vs IND). But I don't think that BGT exists for women's cricket. That maybe due to the fact that the BCCI gave hardly any importance to the women's cricket before Jay Shah became the president. Mafia dons like Narayanaswami Srinivasan and Sharad Pawar were only worried about the revenue inflows, and at that time there was hardly any money in women's cricket.