This is far from the first case. There was a case related to welfare benefits that ended up with a woman fighting for years to have people believe her baby was hers.
It's even mentioned in the article: "A similar case in 2006 saw a 26-year-old chimeric woman, Lydia Fairchild, almost lose her children after maternity tests required for welfare payments suggested she wasn’t actually their mother."
The legal system sees genetic forensic evidence as very strong. This result shows that we need to be a bit more careful about the samples we used for genetic testing - although this means police procedures for extracting samples are going to get a lot more complicated than a simple cheek swab.
Which is, from the point of view of the test, exactly the same thing. However, it's obvious that "mater semper certa est" ("the mother is always certain"). That is, almost always, apparently...
For a mother, it's called "maternity"
Many people who are learning English (as I presume you are) learn the language is genderless, but that's not strictly true.