Yes, she is the grandmother, and no doubt, wants every opportunity to see those sweet boys. But, imoo, if Dan's mother thought WA had anything to do with her son's murder, she wouldn't have spent so much time / possibly stayed with WA.
As far as other theories....perhaps, a new love interest had a sad and jealous almost-ex. Or, perhaps, Dan's research rattled powerful people in Florida who would have a whole lot to lose if their criminal activities were uncovered. I just find it odd that a career criminal has done so little time..... Hypothetically, of course, certain official people in charge of sentencing could receive a cut of drug rings' profits in exchange for leniency....
In my gut, I just believe this is bigger than a custody dispute. But, my gut is biased and possibly naive. I never want to believe that a mother of young children could calculate the murder of her children's father, although of course, I realize that is statistically most likely.
