will be able to follow our lead to assist us during the birth
It's an interesting question - i had a doula and was also in the situation of possible "big baby" (insulin dependant gestational diabetes + a tall hubby had my obs convinced....).

I think there's a really fine line of what is a medical recommendation versus feeling emotionally comfortable and confident to make the right decisions for you. Your words above (plus your post) suggest to me that you don't feel you are being supported quite as you'd like to be... and you're looking for some validation around that.

I struggled with balancing the very medical recommendations I was getting, with the ideal birth situation from a doula perspective. In the end I decided to proceed with an induction (for a number of reasons) but I needed to talk this over with my doula because there were many shades of grey and fears and anxieties for me, naturally enough. Personally, I think having someone who you can explore this with this very important, because, at the end of the day, why do you have a doula? She's not there as your medical support person... she's there as a birth support person... and birth/emotion go hand in hand - let's face it, how many people approach birth as just a "project" to be completed? I believe that my doula needed to understand what was in my head/heart to be able to support both me and my DH as effectively as possible during the birth.

As you said, she has asked if you have any concerns, but it sounds as though you feel she isn't in touch with your current feelings, but you don't want to be perceived as being too needy. And I know exactly what you mean, and it sounds like you don't feel fully connected. Whether your feelings are last minute nerves or not - regardless I think you need to feel comfortable that she understands where you're coming from. Maybe it's worth saying some of what you said in your post, to her? And clarifying what you both believe her role to be, and how she can most add value/support to your experience?