It's a lot of kits... if she's due next week I would not think it would be a good foster situation. It's pretty normal for a few kits to not get fed the first night in a large litter. You could try doing a lap feeding session today, with the ones who don't have full bellies, or you could pull the fattest ones from the nest tonight and check the skinny kits in the morning, or just leave them all in the nest a nd check them in the morning to see if they've caught up