Unfortunately, I think they're starting to wind down Amiibo this generation, Mario Maker 2 not having them was a bad sign.
I think Dixie's best chance of getting an Amiibo is Smash Bros. Diddy Kong got an Amiibo as part of the Mario line, but he generally appears more in Mario spin offs, he was in Mario Tennis Aces while Dixie wasn't.
Which is such a shame IMO because their is so many more Nintendo characters I'd love to own amiibo of. But amiibos seem to be dying as unlike the Wii U era, Nintendo doesnt need the extra revenue amiibo bring/brought to survive as the Switch and its software are selling like gangbusters.
I also think Nintendo kinda shot themselves in the foot with amiibo. Most people who buy amiibo (like myself) dont use them for in game functionality (as amiibo have always been pretty lackluster in that regard) but to own merchandise for characters that dont usually get much and they're fun to collect/display. But instead of Nintendo making amiibo of characters that dont get merch often, Nintendo has seemed to think people only want Mario and Link amiibos. Mario has like what 10 amiibo and Link like 15? It just kinda makes me upset that characters like Dixie Kong, Cranky, Funky, Toadette, Pauline, Tingle, Slippy Toad, Peppy Hare, Krystal, DJ Octavio, Birdo, etc. dont have any and probably will never get any where as Mario and Link have 10+ different amiibo.
Which to tie back into Smash Bros. and I know this is about to sound selfish but amiibo is a big reason I get hyped about newcomers in Ultimate. I love to own different Nintendo characters as amiibo. King K.Rool, Ridley, Dark Samus, Wolf, Incineroar, Pichu, Pokemon Trainer, Ivysaur, and Squirtle I all love owning amiibo of. While Im glad Inklings, Chrom, Isabelle, and Daisy made it to Smash I was like "Well they already have amiibo thats kinda lame" as someone who only likes to own 1 of each character. Also as someone who doesnt collect 3rd party character amiibos the fighters pass when it was announced at the Game Awards let me down. Cause I've stated in the past (and most people on this site know) not a fan of 3rd parties in Smash not only cause of Smash itself but due to a lack of new 1st party character amiibo. I get it, it's a 1st world problem. But just thought I'd give my two cents as one of the last few passionate amiibo collectors left out there.