No, I don't think 11 years is enough.
In an earlier thread, I compared this case with those of Keanu Shuttleworth and Callum Wilson, where in both cases, the mothers were convicted of murder.
I think the only thing that has prevented a murder conviction in this case, is that there didn't seem to be any sign of previous serious physical abuse/neglect (although we'll have to wait for the SCR) , whereas there had been in the cases mentioned.
As for "the judges know best" I don't view the judiciary as beyond criticism, judges frequently give out trifling sentences for domestic killings.
I don't get the calls to have compassion for her. I don't wish her harm, but I have absolutely no compassion for her whatsoever. She does not deserve my compassion, she committed a truly abhorrent act.
Having Googled Theresa Riggi, I think she's likely to have an extremely hard time in prison.