Depression or mental illness?

Depression or mental illness? My mil dislikes me, we stay tgt and now husband and I are moving out (mil ask to move out). We found a place and we are moving out soon. She is not happy.. idk why. Since 2 weeks ago my slippers outside the house are always not in place. Found out is my mil kicked the slippers away from outside the house. From what I know I think depression doesn't do all this(kick people slipper) but mental illness will. Right? If she hurt me then that's fine. I'm worried about my 4yo girl and 2 month old baby. We are close to moving out. But I'm really scared she will do something to my children when my husband goes to work. #Needadvice #AskingAsAMom