If she is growing properly and doesn't look thin~ribby/hippy and such she will be fine. Give the mama some alfalfa which will help with milk supply if worried and good luck~
It should only have discharge for a few days~they will come into heat again around 14days after birth. They are able to breed at 3months old and kid 2x year so please seperate bucklings when they are that age or wether. Also,don't keep the buck with the does unless you are breeding have a...