I've now reviewed the appellate decision. OK, so one important fact is that there were TWO jailhouse snitches, not just one.
It's not clear from the appellate order who else testified against your mom. Did she testify in her own defense? From whom did the facts of the case come from? Did her ex-lover testify against her?
The court here found four aggravating factors warranting a 50 year prison sentence.
(1) prior attempts to murder,
(2) an elaborate plan to murder existed,
(3) the co-defendant lay in wait to commit the murder, and
(4) the victim was your mother's husband.
I've never heard of a co-defendant's "lying in wait" used as an aggravating factor. Perhaps that's valid due to the "conspiracy"? Any opinions out there?
I'm not saying that the court was right, or you are right, or anything else. Who knows what the "truth" is. The fact of the matter is that your mom has pretty much exhausted her legal options here, so she will sit in prison until paroled. And she won't be a good candidate for parole if she maintains her innocence and doesn't show remorse.