As said, main thing is age of kid, the other - how much milk is she giving?
I'm not bothered about much milk, so I'm only milking in the morning, but I don't give too much concentrates either. milking 2 goats, one still with a kid, I'm getting 3 litres, more than enough for us. no point in buying too much feed if we can't use the milk. and goats are looking well.
I like my Toggs - is your girl registered?