I get the understanding that Chapter 1057 left a sour note for many people after how many times Yamato had spoken of wanting to leave and join the Straw Hats, only to delay on that last moment, possibly for more in-depth reasons being kept from readers beyond what Yamato said regarding going on a Wano tour. It all seems to go back to Momo being blamed as the main reason for why Yamato is being "kept" from going out of Wano sooner, but after thinking about the kind of life Yamato has lived, I don't think we should be seeing Momo as the obstacle preventing Yamato from leaving, but as the catalyst.
It just seems to me that for as much as Yamato admired Oden, I've gotten the impression that they never spoke to each other or even bonded, and that Yamato's relationship with Oden before he died was really just that of an admirer looking up to an idol from a distance and nothing more. Yamato instead chatted and bonded more with Ace, sure, but their relationship, from what I saw, never really seemed to get to the point of me seeing Ace as the "Shanks" figure in Yamato's life.
And what I mean by "Shanks" figure is someone Yamato not only bonds with, but also grows to have a shared interest/dream between Yamato and the figure which can give Yamato enough encouragement to sail out with greater purpose, not just in dedication for herself, but also in dedication of someone personal to her who shares the same dream she does, and even get encouragement from the figure to carry it out to the best of her ability.
When I think back to the past, it makes sense to me:
Luffy and Shanks shared an interest of becoming a great pirate.
Zoro and Kuina shared an interest in becoming the greatest swordsman.
Nami and Bell-mere shared an interest in making a map of the world.
Usopp and Banchina shared an interest in the idea of growing brave and strong like Yasopp.
Sanji and Zeff shared an interest in All-Blue.
Chopper and Hiriluk shared an interest in curing any disease in the world.
Robin and Clover shared an interest in finding out the Void Century.
Franky and Tom shared an interest in building a ship that can sail any sea.
Brook and Yorki shared an interest in getting the Rumbar Pirates' final song back to Laboon after reuniting with him.
Jinbe and Tiger shared an interest in friendly coexistence between humans and fish-men.
And when thinking about Yamato's case, I've come to understand that Yamato never really had anyone like that in her life, and that Momo is the first person who can really be a figure like that to her, possibly even go as so far as to share the interest in opening Wano's borders, since both have been shown to be interested in that prior. It could thus give Yamato greater purpose to finally sail out of Wano beyond just being free just for the sake of it, and even go to Laugh Tale with Luffy and the others in getting closure to fill in the missing gaps Oden's journal has.
So going by all of that, at this point, I think it's not just a matter of "if" she'll go out, but when.