I would add some black oil sunflower seeds and a little bit of oats if she's blowing her coat.
Not too much right now, just a pinch of each, but once she has babies give her about a tbs over her feed to help her make milk. That's the one thing my young mother's struggle with.
That's okay, I've had an accidental brother x sister litter before, it happened when I got a gender wrong. And they were large rabbits not yet done growing. But she birthed just fine, only a little help was needed from me.
Since yours is a small breed, and unrelated to your buck, you shouldn't have too many issues with mama or babies.