Some neighborhoods or communities have community dispute resolution programs that help neighbors mediate solutions to problems such as you have described. If yours doesn't and a civil conversation with the older girls' mothers doesn't promise to provide any help for your daughter, you could call the police. Threatening, beating up and pushing past you into your home are crimes.
You could also talk to the management office for your apartment complex. The parents failing to supervise their children's on-grounds, outside behavior may be a violation of their leases or complex rules.
If the older girls go to the same school as your daughter, you could talk to the principal. With the relatively new, federal bullying prevention laws, schools are supposed to investigate and act to prevent or discourage bullying between their students, even if it does not happen at school.
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