You know, if she wasn't going to get in either way, I would have rather she got AT'd at November so she could at least build a fanbase (which is important if you want your character to get a chance in future games).
It was really tragic how Krystal was Assist Trophied right away at E3 2018, honestly. If she had been AT'd in November like Isaac, yeah, it still would have sucked, and the short term blowback at the time would have been even more crushing, but in the long term she could have at least built a fanbase (Isaac's thread is now sitting at a pretty 45,000 replies and more than 1000 pages and 2 million views and is the top active support thread on the site, that's how much a five month difference can make.) Even Ashley being AT'd in August was a better fate (her thread was climbing to 8000 replies until she got shot down in the August direct, more than double this thread, with just two months in difference). You can even see this in the difference between different Fire Emblem characters, for example, Black Knight got Assist Trophied in November and his thread is at 18 pages, while Lyn was Assist Trophied right away in June and her thread just barely got past 7 pages. Another example is with Zelda characters, Skull Kid's AT wasn't shown off until November, while Midna's was shown off right away in June, and look at the difference in sizes in their support threads. The only real exception to this is Waluigi (since he had enough popularity in Mario Kart and the like outside of Smash to back him up, although his thread literally got shut down, his popularity mainly grew outside of Smashboards).
At the end of the day, Ultimate's Base game speculation was much shorter than Brawl or Smash 4's so building a fanbase in that critical 5 month period between E3 2018 and the final November Direct was really essential for lots of first parties.