It is a possibility, but I wouldn't consider it likely, provided the court believes it was the homeless aspect which kept her from being able to do the service, and not a lack of willingness to comply. She should certainly do as much as she can before her deadline, and talk to the person overseeing her as well (though at this late date they likely already know she is way short.) It is possible a court action could begin, and held over her to add more incentive to get the hours done.
Answered on Feb 04th, 2015 at 1:24 PM