First, let me start by saying that in my 4+ years at Hopkins, and over 10 years working for colleges I have never heard of there not being any work-study jobs around. With how much help is needed in all departments and offices at a University it is hard to imagine no openings be available ... but if that is true it is a shame.
Second, I will say that it is about a month into the spring semester and most of the good work-study jobs have probably been filled. Most work-study jobs are filled in the fall semester and students keep their jobs for the full year. There is a huge job / work-study fair the first week of classes each fall and that is where most students complete their applications for jobs with various offices, departments, and organizations. Most of the hiring is done then, but there are still always positions throughout the year.
Is your daughter limiting her search? Is she being picky? She may have to select a position for the rest of the semester that doesn't suit her interests, and then just start looking during the first week of the fall semester.
Most students I know have used the Student Employment Office, Financial Aid office, or just spoken to departments, offices, faculty members, staff members, local organizations about openings. I am sure if she use all the sources out there she can find something.
Student Employment:
Student Employment Services | JHU
I know a lot of times offices (such as Admissions) don't list all their jobs with Student Employment but will still hire throughout the semester. We actually were hiring up until two weeks ago.