Ranting about my mil

For the past 4 years my mil has been accusing me of recording them (inlaws). But they went and order two small security cam.. she even admit it that they got one but never "set it up". I can't believe I've encountered something likes this because I never once would even think to do that. Since we will be leaving them next month (moving 1 hour and 30 mins away). My husband finally told her because she hates my husband and I. My husband and her was never in good terms. She said "good luck, she got you good" should I really be piss off?? I'm so mad because I gifted her things from the heart and she still hates me. I really shouldn't use my energy on this toxic person. She say I act innocent in front of her and the family but behind close door I'm fake. Like does she really want me to be petty with her?? She's always talking about all these other daughter in law being mean to thier mil but I don't even do that.