During drop offs or switches have you ever felt like you walked right into the middle of something you shouldn't have? how do you avoid getting sucking into BM's drama/life?

Yesterday we dropped Skids (ss8 and ss6) off at our regularly scheduled time and place but as soon as we pulled up I realized that something was going on and BM was pissed. She came around the side of her house and yanked off her work gloves, it appeared as though she had just mowed the lawn. Her husband's truck was there but he was not where to be seen, usually he comes out and stands by BM so that DH isn't 'mean' to her. DH tried to talk to her about kids stuff and she just snapped at him. She didn't hug the boys or answer SS8 when he asked her a question.

After we left DH said that BM was looking at her all pouty like she used to right after their divorce when she thought they were friends and she wanted him to asked her what was wrong, he didn't bite thank god.

DH and I suspect money or marriage problems. Or both. DH works with her husband and has over heard some things that sound a lot like the things that he went through with BM right before their divorce. It's not funny but it kind of is since BM blamed DH for all of their issues yet she seems to be having them all over again with her new hubby (only married 1.5 years). DH ever made enough, was never home enough, never did enough for the kids, never got her things, didn't treat her right, ect.

SS8 has also said somethings that make us think there are issues but we are trying to stay out of it. Yeah we get curious, who doesn't but we can't 'fix' BM or her relationship problems. We want to be there for the skids if something does happen though so that they don't think it's normal or right to just walk out on someone and so that they don't think I will just up and leave them.

Thought or suggestions on how to stay out of it but be supportive?