@Itsnotover
She had a termination to spite Hughes.
More or less.
Her ex said that she gets pregnant quickly into a relationship as a way of holding onto her partner. (bless hapless menfolk who are powerless to stop a pregnancy right?
) Anyway, it sounds like sharing children with a partner gave her a manipulative tool to use on them - particularly if they try to leave her. And when the kids angle doesn't work any more, she threatens or pretends to self harm - she was reported missing a few years ago and also the documented suicide attempt.
But I also felt that it was income related - either trying to get a bigger house or benefits as she never worked, but TH did, and presumably earning a decent wage as a plasterer /labourer. That's what she wanted to keep, and a baby was a way of either having him stay and provide for them, or a way of getting child maintenance from him if they did split. Also another potential reason for wanting Arthur out of her way - if TH had let Arthur stay with his relatives, he would be expected to provide financially at least. Less money for her.
So when her defence was setting him up to be the main offender, with her supposedly a terrified abused and unwilling accomplice, the baby was of no use to her any more and had she been successful in her defence and found not guilty it would have been another dependent for her with zero assistance financially or otherwise coming in from the child's dad and certainly not his family.
I'm sure there was also spitefulness and the timing of it suggests that it happened after the first hearing where he refused to even look at her - remember she returned upset to her cell and told her cell mate that? So letting him find out during the court proceedings that she terminated was her 'fuck you' to him for that.
She only wants children that are in some way useful to her. When they serve their purpose or fail to, she is happy to dispose of them. Her two older children, Arthur and this pregnancy demonstrate that.