The implication is there. That is damaging to the persona. Case closed.
It was damaging to no one's persona unless they were named.
This article states it was "written as if it were placed by the mother", but it does not say that it named her.
Additionally, in order for her to be publicly damaged the "public" had to know who it was. Even if the woman was actually named she is NOT a famous individual and there were NO remarks listed that publicly distinguished this Mary Steele from the thousands of other non-famous Mary Steeles in California then she has no case. All the above aside, the alleged libel must cause her actual damages in order for her to be awarded "damages".
You would lose your case, if you could find a lawyer stupid enough to try to take it to court.