nursing only at night? or not at all?

So it's weird I have to ask this at all...I EBF my LO till 7 mths...then started supplementing with formula. Lil by lil formula increased and now at 9 mths she only nurses at night before bed. Lately I don't feel much sensation for let down...is it possible I'm not producing any more milk? She seems happy but falls asleep very quickly. Would she "nurse" without any milk? How can I tell? I also don't notice the larger gulping but she says a lot more solids lately and is really reducing her milk to begin with. So confusded! 🤔