Her, She, Him's

Bailey is having a hard time understanding when to use which word lately. Her vocabulary is expanding, but let's face it-English is confusing! How do you explain pronouns and possessives to a three year old? No matter how you try; it still comes out sounding crazy. When I hear her say something like..."She is just on she's bed". I'll say..."you mean, she is just on her bed." Then Bailey will say, "why do you always say, ""her, her, her, she, she, she""? It can be very frustrating for her, but she has been doing better. We are trying to keep explaining it the best we can as well!