You are right that Sophia is the word for Wisdom. But what Joyce Rupp does is make Sophia into a Deity. While at the same time denying (by ignoring) God the Father because she prefers a female God.
True God is not male nor female but spirit. But… I will use an analogy to explain my next thought.
When I was a child I used to watch the TV show “Bewitched.” It always impressed me that the ultimate insult that Endora gave to Darrin was to refuse to call him by his name.
Jesus told us to call God “Father”. Also as is obvious, Jesus is a male. So by refusing to call God Father, Rupp is insulting to God in the very least.
But her books go far beyond this one issue. She takes her feminist beliefs to the level of heresy.
I was a former feminist, myself. So I know it when I see it.