I think any of the names on your list would work great, but my favourites with your set are [name_f]Edith[/name_f] (nn [name_f]Edie[/name_f]) and [name_f]Frances[/name_f] (nn [name_u]Frankie[/name_u]). There’s been some lovely suggestions already, so count any repeats as seconds!
Susan/Susannah - [name_f]Susie[/name_f], [name_f]Sukie[/name_f], [name_f]Annie[/name_f], [name_u]Sunny[/name_u]
[name_f]Agatha[/name_f]/Agnes - [name_f]Aggie[/name_f]
[name_f]Greta[/name_f] - [name_f]Pearl[/name_f], [name_f]Daisy[/name_f], [name_f]Gigi[/name_f]
[name_f]Clara[/name_f] - [name_u]Coco[/name_u]
[name_f]Alberta[/name_f] - [name_m]Albie[/name_m], [name_f]Alba[/name_f], [name_u]Bertie[/name_u], [name_f]Betty[/name_f]
[name_f]Theodosia[/name_f] - [name_u]Theo[/name_u], [name_m]Ted[/name_m], [name_u]Teddy[/name_u], [name_f]Thea[/name_f], [name_f]Dora[/name_f], [name_f]Theda[/name_f], [name_f]Thora[/name_f]
[name_f]Florence[/name_f] - [name_f]Flo[/name_f], [name_f]Floss[/name_f], [name_f]Flossie[/name_f], [name_f]Florrie[/name_f], [name_f]Flora[/name_f]
[name_f]Hilda[/name_f] - Hilly, [name_f]Heidi[/name_f] (?)
[name_f]Lettice[/name_f] - [name_f]Lettie[/name_f], [name_f]Etta[/name_f], [name_f]Ettie[/name_f]
[name_f]Thomasina[/name_f]/Thomasin - [name_m]Tommy[/name_m], [name_f]Sina[/name_f], [name_f]Tess[/name_f], [name_f]Tessie[/name_f], [name_f]Tessa[/name_f]
[name_f]Maude[/name_f] - [name_f]Maudie[/name_f] (or something like [name_f]Matilda[/name_f] nn [name_f]Maude[/name_f])
[name_f]Frederica[/name_f] - [name_u]Freddie[/name_u], [name_f]Erica[/name_f], [name_u]Teddy[/name_u], [name_f]Edie[/name_f]
[name_f]Mary[/name_f] - [name_f]Mamie[/name_f], [name_f]Polly[/name_f], [name_f]Molly[/name_f]
[name_f]Philippa[/name_f] - [name_u]Pip[/name_u], [name_f]Pippi[/name_f], [name_f]Pippa[/name_f], [name_u]Philly[/name_u]
[name_f]Wilhelmina[/name_f] - [name_f]Willa[/name_f], [name_f]Wilma[/name_f], [name_f]Mina[/name_f], [name_f]Minnie[/name_f], [name_u]Billie[/name_u], [name_f]Ellie[/name_f]
[name_f]Bridget[/name_f] - [name_f]Birdie[/name_f], [name_f]Bridie[/name_f], [name_f]Etta[/name_f]
[name_f]Alma[/name_f] - [name_u]Allie[/name_u]