Your girl can have Original 80/10/10 products or Forage once whelped but she needs a lower bone content when pregnant.
When she has given birth it is much more simple - she will generally just need more more more food as it requires lots of calories to feed pups. If she hasn't got a really high appetite then choose some naturally fattier meats - lamb, duck, tripe. If you're feeding Forage great, if Original then adding an egg would be good, including oily fish too (our Surf & Turf recipe would be perfect).
She needs lots of variety and lots of quantity - however much she wants whilst nursing really.