Yes, there is something else you should be doing, IMO.

Letting your daughter discover things for herself without you telling her them. I'm not being a judgemental parent, I'm just going to say this: atm, you are teaching your daughter there is a right and a wrong answer (to flashcards, numbers etc). You are not encouraging creative solutions. Why not spend two hours letting her investigate how reflections work? You just need a mirror she can peep in and out of. She can come up with hypotheses and test these. While it isn't formalised and written down, she's still discovering and learning. What about splashing water (ie discovering the properties of fluids)? Dancing and singing to the radio? When she's a little better and wants to practice fine motor skills, how about seeing how to build a big tower from plain wooden blocks (she will figure out that wider at the bottom makes it more stable)? Baking? Making up your own stories and endings to them - offer your daughter a choice of what happens next, let her tell YOU what's right and wrong in her world?

I have a very switched-on child. I teach senior school children and his maths ability, at age 5, is above some of the children I teach. But I don't push it. He loves basic algebra, but discovered it himself. Worked it all out and told me. I'm really pleased for him. He loves reading, and will try to read my books (although he does quickly lose interest!). But I didn't need to push him, or start early beyond answering his questions about letters. This is also the child who asked a policeman if sharks always are baddies who eat people, if aliens are goodies or baddies, if red dinosaurs get along with other dinosaurs and if Wolverine the superhero could beat a red dinosaur. (Policeman asked if he had any questions during a school visit, poor chap.) Please let her learn through play and not about pleasing other people, that her ideas can be wrong and that her academic smarts are the most important thing about her.

And yes, this is from the mother who explained how soap works to her 6 month old, demonstrated dissection skills while preparing the vegetables for dinner and talked about the importance of tides in the sea shore habitat. But I did that for me, I didn't expect Liebling to get anything from it beyond hearing different words/sounds and having me talk to him about something that didn't drive me batty.
She does do a lot of these things. Hope I haven't come across like some over achiever type mum. I know exactly what you mean about her learning from her own experiences, that is mainly what she does, apart from flash cards and me counting. I think I just worry that she needs more. It's comforting to know that we are on the right track.

Sometimes I worry I allow her to be her own teacher too much, and she needs more from me. She only has simple things to entertain herself with. A ball, a plastic mirror, a rattle. She's discovered her feet, her toes, the mirror, the door, the trees, shadows, water. I feel like very little has been necessary of me teaching her.

Her mind is a little sponge and I want her to fill it as much as she can. These are such precious years for us, and I want what's best for her.

Just over thinking things I guess