I have a friend with braces and shes been freaking if she hardly brushes&she feels a hole on her tooth will there be a hole when the braces come off?

Could be: If your friend has a hole in her tooth, she needs to tell her dentist or orthodontist about it. Wearing braces does not mean you can't develop cavities that need treatment or repair.

Brush and floss: She needs to brush and floss around the braces otherwise she may develop cavities with those teeth. Unless she meticulously cleans around the braces, she may develop some demineralization around the brackets, which is softened enamel that can easily turn to cavities. She can also add a Fluoride rinse to her regimen to reduce caries risk. You are a good friend to be concerned.