My little sister has a chipped tooth in the front, is there anyhting i can do?

Yes and soon: Several questions need a reply. How old is she? How long ago did this occur? Is there any discomfort? How significant is the damage? Dental trauma is best treated as soon as possible. If she's a young child, contact a local pedodontist (children's dentist). If an adolescent or older, a local general dentist. Depending on the severity, it may only require bonding. Don't wait!

Take her to dentist: A chip may be minimal and require a simple polishing type of adjustment. A chip may involve a deep crack and require restoration - either a filling or a crown (cap) depending on various factors. She needs to see a dentist who will evaluate the chip and explain the best treatment options.

Call a dentist: Not much you can personally do. It may be just a simple repair with bonding.