Should i be worried about the mental state of my 3 y/o?

She LOVES drawing, and she's always had a really active imagination, so I think it might just be that, but it's hard not to worry. I have a family history of mental health problems starting in childhood. Anyway, she's drawn people all over her walls (she smuggled a crayon to her room), they scared her for a while an she keeps telling me stories about the 'wall people' she says they talk to her and play games with her. Like I said I'm sure it's normal kiddie stuff.