Our expert says:
Certainly the rapid and unplanned pregnancy is regrettable and still a problem. However you raise other issues as well. And if indeed she is unstable as you reasonably expect, this illustrates another reason for people to be far more cautious than they usually choose to be, about carelessly creating pregnancies - not only is a pregnancy an added challenge to someone who may be already challenged, and could be unhelpful to her mental health, but if she is suffering from some varieties of disorder, there could be additional risks for the coming child, too.
Second choices need to be earned, rather than just randomly allocated, too. You seem to be describing someone deluded, and even possibly hallucinating, and paranoid. Her comments sound as though they have so little reliable relationship with objective truth, that you can't assume anything she says about her past or present is true - or, indeed, that it is false.
One problem is that even if she is significantly mentally disturbed and unwell ( and could grow more so during or following a pregnancy ) unless she becomes grossly and obviously disturbed, such that she can be clearly seen as a risk to herself or others ( including you or the baby ) it won't be practical to enforce the assessment and treatment she may very well need.
It may also be worth getting good legal advice. It may be important, especially if she continues with the pregnancy and gives birth, to assert your rights as biofather through the courts, apart from your personal wishes and interests, but also to be able to protect the child from her possibly deluded beliefs and behaviours. It is possible that in the course of such a legal action, she might reveal her obcure and worying mental state actually in court, and this could posibly be used so as to have a court order her to enter a hospital for psychiatric observation and assessment, and even treatment, if this is deemed necessary.
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