I feel like I can see both sides of this conversation. While being a mother is the coolest thing ever to most people and arguably the most rewarding thing any woman can ever experience, it doesn't automatically mean that everyone wants to experience this, which really is their right to decide. So I think that the most important overarching message that your daughter hears about her life should be: "Be the best ___ that you are capable of being, be courageous to be who your heart already really knows that it is, and don't let outside pressures to be, or not be, a mother (or anything else for that matter) influence you too much.
Having said all this, I imagine it will all work itself out just fine, because the other complexity that you mention is your daughter's age. 16 a bit on the young side for anyone to know what they want to do/ be when they grow up, let alone knowing how they feel about a responsibility as monumental as having children. So I imagine that as she gets older she will have a more defined sense of what she does and doesn't want to include in her future. But for now, I can see why withholding pressure to be or not be anything is worth considering. Pressure is different from empowering and modeling. The two latter do not come with judgement. Modeling that being a mom is awesome and being open to talking about it is different that pressuring someone. ... Just my two cents :-)