Considering (((they))) were prolly trying to kidnap one of her kids, and the strange letter full of powder, the emotional stress/safety concerns were likely too much to bear.
If you've noticed, Don Jr.'s wife didn't take as well to the spotlight as Eric's wife…she was hardly ever on TV. The deep state fucks prolly had their crack psychologists on this and surmised she was emotionally vulnerable. Target was likely thus engaged.
Also, Don Jr. goes harder on (((them))) than Eric, IMO.