I think they only buffed her group atk to 24% but yeah Acacia is a good enough Sweeper Rainbow/Debuff Hybrid as it is.
For offensive Crit Teams i would prefer Himeshara X-Mass though.
Btw. i beat the newest EX-Aqua Shadow Map. It was rather easy. Stupid Connection Hiccups are harder to deal with
Edit:
I also beat this. Overall time to beat all those maps (a few breaks in between): 3 Hours.
Yeah the game runs really slow today