Mom issues

So my mom has like major issues with my in laws. They never disrespect her in any kind of way shape or form. It seems like she has some vendetta against my husband. We just had our baby shower Saturday and all of a sudden she starting drama over the grass not being cut. [my yard] If I don't have an issue with it why would you? She's complaining that someone at the baby shower said that my mother-in-law was complaining about the grass not being cut. Wft? Like are you serious right now....? All she doing is pushing me and my son away from her. I'm just so irritated and frustrated with her. She always find a way to make it about her. I'm so tired of her negativity.