Consort Ling died young, this is true, however many people died young in that era for many reasons. My understanding re: "flipping the green tag" is that just because the emperor picked someone didn't mean he wanted sex. We can assume that's what he usually wanted, but it could just be that the emperor was thinking about a consort and wanted to spend some quality time - they could have been talking or whatever. Apparently he was flipping Consort Yu's green tag into her 70s. So I think to say Consort Ling might have died because of having to sex the emperor right after giving birth... that's a stretch.