Have you sought help from a doctor yet? Is this possibly clubfoot? A doctor is needed for proper diagnosis, but typically the heel tilts in and down and the forefoot turns in during clubfoot...but this condition is usually noticed on ultrasound images before the child is born.

Children's bones grow continually and reshape in a process called remodeling. Growth starts from the growth plate...and might be modeled or altered using a brace.

I'd suggest that you first see your grand daughter's pediatrician and seek help from a referred specialist ASAP.