My MIL is a sociopath...

I am genuinely concerned that my mother in law is a sociopath. It started with little manipulations and lies, I caught on pretty quick. She's definitely narcissistic, but the more I'm learning about people with antisocial personality disorder, I'm almost convinced she is. It's terrifying some of the stuff she says and does without any remorse. And it's gotten WAY worse since we got married, almost like she was on best behavior before but doesn't care anymore about showing her true colors. My husband is in therapy to work through the traumas of his childhood. But it freaks me out that she could have no conscience!! I don't even know what to do about it anymore. She does NOT like that I've started sticking up for myself. I know best solution would be to not see them but that is easier said than done, especially in these beginning months of breaking away.