Mash Ascension

I don't think it's a problem, experienced the same, but I just manually changed her Sprite on the character skin tab after you click her in the spirit origin list in the formation tab.
If you experienced this you also need to change the command card and portrait under her NP.
Anyway just feel free to play around it

I think its a bug; her sprite, icon, and card skin don't automatically update to the new version. You can do it manually though.