BEM, each license can be used on two computers! It is done especially for the situations like that -- child using it at their parent's and grandparent's house, with parent and therapist, etc
On the other hand IF the school does work with special needs children, and is interested in incorporating the program with other special needs children in their care, there might be a school grant available from EEECF, they can contact EEECF directly --
http://www.eeecf.org/sponsorships/charitable-institutions.php or can communicate through you.
If they will be incorporating the program in your daughter's schooling, they probably will be interested to make it available to other children with special needs, especially since they already would look into logistics of syncing it with their teaching routine.
Documenting the implementation may help other schools serving special needs children to benefit from Little Learner grants and scholarships.