Honestly, Moira got it worse than Maddie. Maddie was around for only a short while (relatively) and basically doomed the minute Jean came back. Moira's basic character was around for over forty years (yes, I'm counting the time she was dead, if Gwen Stacy was revealed to be alive and a mutant and everything about her a lie I'd say the same thing), and there was basically nothing that made editorial want her gone other than her being a human that was actually nice.