Why did my mom go crazily emotional?

last night my mom wasn't feeling good. she sat on my bed & started talking like a child and kept crying for no reason. she gave my sister and me the hardest time! she went on like this for about an hour or so. she would constantly look around & she saw a sheep (stuffed animal) and started asking why it was staring at her? she then cried about why we didn't offer her orange juice for her throat. i asked her if she had some bendryl & she said "i don't know" she was being very stubborn about everything. later, she kept saying that she will not go to sleep & no one can change her mind. a second later she laid down on my bed & refused to go to her room to sleep. she finally fell asleep. this morning i asked her what had happened to her & she said nothing & doesn't remember anything she did.. what is wrong with her?