Yes, perhaps, but a problem is that Ellen G. White was a female leader in the SDA denomination.
One can debate whether or not she was ordained. But, it is unlikely that any informed person would argue that she was neither female nor a leader in this denomination.
Some might say that she never held an elected office. But, it is clear that she was given, the same credentials, over a period of several years, that we give SDA pastors. If we consider SDA male clergy to be SDA leaders we must consider EGW to be a SDA female leader.