Despite an incorrect second name it does look a likely candidate for Elizabeth on the 1901 census
RG13 652 folio 202
Royal Normal College and Academy of Music for the Blind Upper Norwood Croydon
Elizabeth Anne Mortimer Pupil Single 16 Student London Blind from Childhood
You can find records for the Royal Normal College and Academy of Music for the Blind at the London Metropolitan Archives which include scholarship and beneficaries records from Gardner's Trust for the Blind, so you might be able to find out quite a lot about Elizabeth.
http://www.nationalarchives.gov.uk/nra/searches/subjectView.asp?ID=O53177There is no indication that Frederick had a disability on the 1901 census (as already stated by Anna)
RG13 159 folio 58
74 Hampden Road Islington
Edward Shepard 48 Head Married Dustman Oxford Oxfordshire
Elizabeth Shepard 38 Wife Married Islington London
Frederick Shepard 16 Son General Labourer Islington London
Edward Shepard 12 Son Islington London
John Shepard 10 Son Islington London
William Shepard 4 Son Islington London
Harriett Shepard 4 months Daughter Islington London
Regards
Valda