I am looking for an app for either a smartphone and/or tablet. I want to get my middle schoolers text books in ebook format and have the ability for her to highlight a word she can not read and have it spoken to her. I am not really looking for an app to read the whole book, just something to assist with words she does not know. So she can go along reading on her own but have some help with a word if she needs it. Is there anything out there that does this?