If you live outside the US and want to purchase her books as eBooks, they are available through

Apple iStore:

Within the Walls,  Breaking the Silence

 

KOBO:

Within the Walls,  Breaking the Silence

 

UK -- Inktera:

Within the Walls,  Breaking the Silence
 

Australia -- Collins Booksellers

Within the Walls,  Breaking the Silence

 

Canada -- Indigo

Within the Walls,  Breaking the Silence