The names, the flow but mainly what you think of when you hear the name, what imagery comes to mind?
[name_f]Mabel[/name_f] [name_f]Augusta[/name_f] [name_f]Edith[/name_f]…
First impression: the quiet strength of the name; no hard consonants and sweet flow; each name is solid
[name_m]Just[/name_m] lovely, but then I happen to like most every name in your signature.
I think [name_f]Mabel[/name_f] [name_f]Augusta[/name_f] [name_f]Edith[/name_f] flows very well. I normally would not like the sound of three older names together, they can sound harsh, but these three together create a lovely combo. I picture a girl/woman that is soft spoken, rather shy. She has a natural beauty. Maybe a bit old-fashioned.
Oh man. I adore this combo. Absolutely stunning. (Though I am biased because [name_f]Mabel[/name_f] and [name_f]Augusta[/name_f] are both on my list!) I picture a prim and proper little girl who is sweet, kind and obedient to her parents. But sometimes she can go outside and get a little dirty and have fun playing in the creek.
I like all three names, however the flow from Augusta to Edith gets me a tad hung up. What about Mabel Edith Augusta? I feel like it flows off the tongue better.
The first image that comes to mind is a pleasingly plump bookworm. Kind of mousy, but in a positive way. Dark hair, big brown eyes, a bit pudgy…very into the classics, but rejects Jane Austen and Bronte books because she yearns to be a modern woman.
Sounds like you’ve been pulling names from the my maternal grandmother’s family tree. 
[name_f]Mabel[/name_f] [name_f]Augusta[/name_f] is absolutely delightful! The addition of [name_f]Edith[/name_f], however trips my tongue a little; the -a ending of [name_u]August[/name_u] and the -E beginning of [name_f]Edith[/name_f]…
I really like all three names but not in that order. I agree with the others that [name_f]Augusta[/name_f] [name_f]Edith[/name_f] doesn’t sit well. I prefer the following, especially the first two.
[name_f]Mabel[/name_f] [name_f]Edith[/name_f] [name_f]Augusta[/name_f]
[name_f]Edith[/name_f] [name_f]Mabel[/name_f] [name_f]Augusta[/name_f]
[name_f]Augusta[/name_f] [name_f]Edith[/name_f] [name_f]Mabel[/name_f]
Sweet tempered, sensible, tidy and self aware.
Thank you & yes we do seem to share a love for classic names as I also love the names of your children!
I’m glad you don’t think they sound harsh, interestingly enough, [name_f]Augusta[/name_f] has always been a strong but also a light name to me, so I feel it lifts the combo.
I’m really glad you like it so much, thank you for commenting 
I’m going to throw a wrench in the works here… I love the name (even though it’s not my usual style, so well done!), I have no flow problems from [name_f]Augusta[/name_f] to [name_f]Edith[/name_f] and I imagine a little girl going by the nickname [name_u]Gussie[/name_u], more of a tomboy behavior but also full on girl. Kind of like female CEOs and politicians can be successful, powerful AND look hot. 
I don’t think [name_f]Mabel[/name_f] [name_f]Edith[/name_f] [name_f]Augusta[/name_f] flows very well syllable-wise but thank you for your input, it’s appreciated.
I like [name_f]Mabel[/name_f] [name_f]Augusta[/name_f] [name_f]Edith[/name_f]. A very genteel, graceful gentlewoman comes to mind.
I love both [name_f]Mabel[/name_f] and [name_f]Edith[/name_f] (but am not a fan of [name_f]Augusta[/name_f]).
Maybe I am 
With certain other combos, I’d agree but [name_f]Augusta[/name_f] [name_f]Edith[/name_f] seems easy for me to say.
I think that with the combos you mentioned, the syllable-flow is off, and the third one would still have [name_f]Augusta[/name_f] [name_f]Edith[/name_f] in it; still thank you for your comment
[name_u]Love[/name_u] love love it!
[name_f]Mabel[/name_f] sounds both like a cute little girl and an old lady in the best possible way (it was my beloved great grandmother’s name!).
[name_f]Augusta[/name_f] is noble and gorgeous.
And [name_f]Edith[/name_f] sounds vintage and intellectual to me.