I own a Kobo Glo and an Aura HD. I found a solution to get, more or less, the index you are looking for on my Kobo devices.
I created two custom columns in Calibre.
1. custom column = regal (this is used to get a collection for different genres)
program:
$=field('tags');
first_non_empty(
contains($,'Roman','1. Romane',''),
contains($,'Krimi & Thriller','2. Krimi & Thriller',''),
contains($,'Novelle & Erzählung','3. Novellen & Erzählungen',''),
contains($,'Lyrik','4. Gedichte',''),
contains($,'Drama','5. Dramen',''),
contains($,'Märchen','6. Märchen',''),
contains($,'Sachbuch','7. Sachbücher','')
)
2. custom column = serie_kobo
{series:| 8. Serie: |}
The KoboTouchExtended plugin is configured “collections: authors, #regal, #serie_kobo”
When I open the library by choosing collections I get on the first page the genre collections “1. Romane” to “7. Sachbücher”, followed by collection “8. Series: AAA, 8. Series: BBB, 8. Series: CCC” and so on. After the “8. Series: XYX” collections the authors with their books are shown, no matter of genre or within a series.
In your case, you only need the second custom column and change the prefix of the series in “1. Series:”
To get a better impression look at the pictures of the first four pages of my library.
Maybe this is a solution for you and your mother.
