Yes, I know her
Could I say: Sí, conozco a ella, without the yo before conozco and la before conozco? (Sí, yo la conozco a ella)
1 Answer
The yo can be dropped.
You cannot drop the la.
You do not need the a ella, it is allowable but provides no information.
Here is a nice answer from lazarus that agrees with me. I think everyone who knows of him trusts his answers. it is a ways down in the thread
http://forum.wordreference.com/threads/la-conozco-a-ella.343279/
Conozco a una niña (okay)
Conozco a ella ( wrong)(el C.D. es un pronombre; la duplicación es obligatoria)
La conozco a una niña (Wrong) (duplicación incorrecta)
La conozco a ella (okay) (duplicación forzosa)