I think they did know she was pregnant, and they were going to remove the baby at birth (if they’ve had three kids taken into care there’s basically no way they would be allowed to keep any future babies). So they decided to run.I'm beginning to think the big police involvement is because SS may have dropped the ball. They must have known she was expecting, the car was completely burnt out the pics released don't show a baby.
And in social services’ defence, I don’t think they could have predicted the chaotic things that ended up happening, or physically prevent them from doing a flit in the first place.
No sightings in nearly a fortnight so I think they must have succeeded in leaving the country.