what does "go with the flow" means when it comes to doing things with a partner?

I met a girl once, now we are writing again. She asked me what I liked to do with my former partners. I told her about concerts, gallaries, sports. And she just said: "I likes to go with the flow." Every time I ask her what she likes to do, she always answer with "everything". Hugh? Pls explain this to me like I am 5 years old. I am no English native speaker and never heard of this phrase in dating context. What does it mean?