I understand that people might not like her policies, but this stuff is clearly targeted swift boating. It doesn’t add to to the discussion.
It's perfectly plausible that she could have been "constructively discharged" on account of her pregnancy, which morally would amount to the same thing.
But I think based on what is written, either that article or Warren has to be lying about specifics.
As a Democratic primary voter, I'm indifferent to this story, and will probably go with Warren if everyone else does, but if I cared, obviously I would check on the source, no matter how disreputable the publication.
Edit: I reread it a few times and now I think it's just BS framing by the Free Beacon. She had her contract renewed, but she resigned at the end of the school year, I'd assume before the new contract took effect. Probably was told she had to. To assume her story is perfectly consistent, you just have to assume they noticed she was pregnant in those couple of months.