Oh, you're right, kids can understand things far more than we give them credit for. You can explain any topic them well enough, its just they don't have the life experience or emotional maturity to put that information into context.
And yes, while A11-y was created as a partition from the Gynoid, she is still meant to be her own person and experience things differently from her mother. She has questions about love and sex and death, but she still needs experience and maturity to put that information into context. And that's something that can only be acquired with time. Essentially, kids, A11-y included, need to learn how to walk before they can run.
So, there is a complicated difference between "lived experience" or wisdom, and knowledge. All wisdom is knowledge, but not all knowledge is wisdom. Some things just can't be fully understood until they're experienced. However, that's the kicker there...
fully understood... As a species, we've advanced as far as we have because we are able to impart wisdom as knowledge, and that knowledge prepares the next generation so that they have to spend far less time and energy on the experience phase to create wisdom, allowing them to take from the previous generation and build on it with their own new experiences.
With children, and Ally, we accomplish this, mostly, through repetition. You probably remember watching the same childrens films over and over, or how all the cartoons you watched had the same lessons to teach. Storytellers, throughout history, often retell the same tales over and over.
These conversations would need to be the same. They wouldn't be a one time thing, and they'd likely never be over. They'd be open ended conversations where you made sure that you communicated to the child both that they could come to you and ask about things, and the boundaries you have on that conversation. With this, you slowly build on a foundation of knowledge that expands with experience, which itself happens quicker as they have to figure out less on their own.
So yeah, you're not gonna sit Ally down and tell them what sex is and that's that. You're gonna set some boundaries, let them know some basic information, and encourage them to come to you with questions. That said, while I think Ally will be curious, I doubt she'll have any urge to do more with that information until she has a body that can interact with those desires... Like, a lot of our conception of sex and sexuality is based on hormones and for android, programming. Ally would probably look at sex the same way my Asexual friends often do... like it's this hilarious and alien thing some people do.
As for slavery... you and Android might lay the groundwork, but Ally should probably be encouraged to talk to Lin and Nia about it.