[name_f]My[/name_f] personal favorite two for [name_f]Martha[/name_f] have always been [name_f]Martie[/name_f] and [name_f]Mae[/name_f]! Perhaps you could also get [name_f]Marnie[/name_f] and [name_f]Melly[/name_f] from combining the sounds of [name_f]Martha[/name_f] and [name_f]Eleanor[/name_f]?
[name_f][/name_f]From your options, my favorite would probably be [name_f]Marty[/name_f]. [name_f]Martha[/name_f] “Molly” is quite sweet too. I would imagine that [name_f]Maisie[/name_f] would work, but only in conjunction with also calling her [name_f]Mae[/name_f] from time to time. Like similar to nicknaming a babe [name_f]Mim[/name_f] and then getting to Mimsy! [name_f]Emmy[/name_f] also makes sense. I think all of them work apart from [name_f]Hattie[/name_f], but I can also see that one being fine as an “in the house” nickname that only family calls her.