She was asked 20 Questions by the USA Border she told them that she would buy a ticket on the 29th to return home but she does not remember if she told them when that day would be since her Passport was not stamped doesn't that mean she could stay here up to 6 months ??

And that if she was to want to stay up here longer which her intent was not but it changed while she was here that she could explain that while trying to apply for a green card, visa, or me sponsoring her to live here or such not ??