Yellow fluid from under driver's side

What is your question?

My wife is 350 miles away, otherwise I'd go look myself. She noticed a couple of spots of yellow fluid in the snow under the car this AM. She said they are on the driver's side behind the driver's door. The only thing I could think of would be brake fluid, but I don't know the car well enough yet to say for sure. Could there be something else leaking from that location? Are there brake line joints in that area? Thanks!