I used a bunch of high tier units and my main problem was not doing enough damage to her and not her killing off my girls which were all 5* and level 100. Most of which had 2-4 slots on them as well. It took me three (or was it four?) tries to finally finish her off.
On C6 Hard I was able to beat the mission in exactly 11 turns using the following team: 2s Mifuyu, ? Slot (I don't remember) Support Alina, and 2s Kaede. Wave 7/9 was Alina connect to Mifuyu with Accel disc, Mifuyu accel disc, Kaede use Magia. Wave 8/9 Kaede connect to Mifuyu with Accel disc, Mifuyu attack, Alina use magia. Wave 9/9 Mifuyu use Doppel, I had Kaede queued after this but all enemies died from Mifuyu's doppel so she never needed to attack.
last edited at Jul 30, 2020 11:54PM