I read somewhere that a sow lets her milk down for about 5 minutes, but a piglet will stay attached for as long as the sow lets them.
A few years back when I worked with a herd of 12 sows, I found from one particular blood line all the gilts were aggressive first time around, normally to the piglets and sometimes to men (but fine with women), but by the 2nd time round had settled down quite a bit. In nearly all cases the gilts and the piglets were left together, could mean that half the litter was lost, and the rest were weaned at 6 weeks, but all the ones that lost any due to their mum skills seemed to have learnt the 2nd time round and kept nearly all.. was normal to loose one. They had litters of around 10-14.
So hopefully your gilt will be better next time, but she might not be as you hasnt had chance to kill them off so to speak. You have to weigh up the costs for yourself and which is more financially viable over a long period.