Would she be open to getting hair analysis done to see if she's deficient in lithium? Lithium Orotate is OTC and has gotten favorable reviews on bipolar boards. I was looking into it a while back for insomnia related to hypothyroidism/adrenal fatigue.
Also, low thyroid functioning has been linked to bipolar and schizophrenia. Iodine supplementation might help too (check out the Iodine supplementation board here on curezone). It's clear this woman needs help and should get help for her sake and her child's.
But I agree with Blue Rose, if she won't get help, then the child's father or grand parents (either side) should step in assuming they're not dealing with addiction issues or mental health issues.