Kobo Touch - Fonts for Sanskrit and diacritical marks

Hi all, :)

I'm new here. Hello!

My mother saw the Kobo Touch for £29.99 in WHSmith's and bought one for my sister's birthday (last week), and one for my birthday (next month).

My sister has been having a few problems with her's and we're hoping you might be able to help sort them out. Instead of listing all of her problems at once I'll do one at a time.

One of the main thing she uses her Kobo for is reading Krishna books as part of her religious studies. She bought a lot of ebooks (the format was .prc) from here.

When she views them on Calibre reader they look perfect, but on her Kobo some of the diacritic marks are messed up. For example 'Kṛṣṇa' shows up as 'K a'.

I've worked out that it's because of fonts. If I change the font to Dyslexie 'Kṛṣṇa' shows up as 'K ṣ a'. The site she got the books from only gives advice for viewing the diacritic marks properly on Android readers.

I've tried 'Sariga', 'ScaGoudy', 'Sanskrit-Times' and the 'Balarama' fonts (which I downloaded from here and here) but if anything, they seemed to make it worse.

Does anyone have an idea?

Thank you!