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There is no way on god's green earth that the woman should apologize for being pregnant, and there is no reason that she shouldn't leave to raise her child.
It doesn't sound like she has a contract (which might change things) - she's employed at-will, and therefore under no obligation to stay with an employer if her situation has changed. How many companies can you think of that would guarantee 2 years of employment and keep to it if there was an unfortunate change in the market? I'm sure many of you Salon readers have lived through the layoffs of 2001-2002. If it became inconvenient for this woman's boss to keep her as an employee, she'd be gone in a second. Companies don't bend over backwards for their employees anymore, so there's no reason employees should do the same.
Say you're sorry you have to leave early, but leave.