Crazy mom

So I asked my mom to only let my son take short naps because I work and she watches him so I only get around 4 hours or sleep a night. When I said that, she started yelling and cussing saying that I'm immature and that I dictate everything and that I tell her what to do (this came out of nowhere). But it's so set in her mind that I hurt her feelings and that I "turned the conversation into something it wasn't" when all I kept saying was that she needs to talk calm and not to cuss around my son (as she's talking over me and cussing at me). Wtf do I do? I already told her I will have someone else watch him but what the actual fuck is her deal