It's not a cheap shot when, given all that we know about her endless pathological lying and manipulation, it's very plausible that getting pregnant twice during her trial is a ruse in an attempt to diminish her sentence by manipulating peoples emotions around mothers and children. She doesn't deserve the benefit of the doubt that you appear to be giving her, especially with this new data point that she was allegedly attempting to flee to Mexico.
But maybe there is no deception and she saw it as her last chance to have children before prison. That is possible too. But it still has the appearance of attempting to use her pregnancies to influence justice, regardless of if she intended it. I mean, what kind of heartless people would send a new mother to prison?