"The girl is at her home."
Translation:La fille est chez elle.
Need some help here. What's the proper use of chez, why does elle come after it (chez)?
Chez means "at" or "in the home/business" of someone. "Chez elle" means at her home. It is used in conjunction with a person and not a place. For example you can say: Je suis chez le pharmacien. I am at the pharmacist's. However, you cannot say: Je suis chez la pharmacie. Here "la pharmacie" is a place "the pharmacy" and not a person. Instead it would be written: Je suis à la pharmacie.
Basically chez + person
chez moi, chez ma sœur, chez eux, chez le médecin, chez la boulangère, etc.
Plus 'chez soi' for reflexive situations involving the third person.
à sa maison would usually be interpreted as "to her house". Je vais aller à sa maison / I am going to (his/her) house.
To mean she's home at her house, you'd say "chez elle" or "dans sa maison".