Purple Finch. Viewing your images I see a bill that doesn't belong to a Pine Siskin.
I missed your specific query as to female bird. Purple Finch take two years to mature. This means a young male will resemble a female until it reaches maturity. My personal best rule of thumb is that a Purple Finch that resembles a female bursts into full song, it's an immature male.
Thank you for your reply!