It seems there were various reasons why Moltke left the show. The big one, of course, was the she "spectin'." Apparently, she was also tired of playing only little-goodie-two-shoes-Vicki and wanted to sink her teeth into the opportunity to play a different (and even darker) character like all the other performers did. Didn't she also state later that she was willing to return (particularly if she got to play a another character here or there)? I wonder if, let's say, DC had negotiated with her (maybe there was an attempt - who knows?) and she had been allowed to temporarily leave the show (at that time, quite necessary since she was pregnant), how it all would've turned out. Of course, she would've been gone for months and they could've explained her departure on just going somewhere like they did with all the rest who took sabbaticals. Maybe, because she was not yet obviously showing, they could've sped up the marry-Jeff-he-then-vanishes story and Liz sends her away for a long rest and vacation to get over her "grief." Maggie could've still stepped in as the governess, go through the whole Quentin/Beth haunting, and then the 1897 plot with later during it Moltke returns but as another character during that time. Maybe Lady Kitty? Or another Gypsy? Then back to 1969 where she returns as Vicki and they resolve the Liz/Vicki mother/daughter thing as a subplot during the whole Leviathan thing. In PT70, she could still be Victoria Winters, but working as a maid and an evil henchwoman to evil housekeeper Hoffman.
Gerard