I'm in two minds about this. On the one hand, maybe it was calculated, but on the other hand, she met her husband in 2017 when she was 33, they got married two years later and then had children. If she wanted to have kids, that's an entirely normal timescale and the start of the decline of fertility. If she knew she was likely to go away for a period of time then even if that period of time was say five years, it would become much harder to become pregnant when she got out. It's not ideal but loads of kids grow up with one parent and whilst it's not ideal having one in prison at least they will have some sort of relationship until she gets released.