The way I see it, if you are concerned, that is valid and holds some meaning. I understand the difficulty in raising it with her; I experienced something very similar with my first therapist and I held a deep fear of the relationship changing, or losing that 'special' quality.
It's important to ask yourself this question: "Does this feel therapeutic?". If the blurred boundaries are impacting on your therapy in a detrimental way you owe it to yourself to address it. After all, therapy is what you're there for, not a new Mom.
For my part, I never addressed the boundary crossings directly, and abruptly left my therapist when the confusion became unbearable. This was very painful and involved a period of grieving. I'm not saying that is the way things will play out for you- that can depend on any number of variables, however I do regret not being wiser to the ways in which the relationship had become non-therapeutic and detrimental to me.
I wish you all the best in determining the best way forward for you in this situation, and I hope my experience can be of some value.