Alisha, I recommend for demon wall that you choose a side to take the bees to and a side for the range to go to during the fight to help ease stress. I generally grab the bees and run to the left side and have range on the right so that you don't need to worry about the bees AoE as much. Also, try to be on the side before the wall throws the line attacks so you only need to move twice. Also, you shouldn't need anything for AK past the level 50 FC weapon, anything better just makes the fight faster. I've done AK so many times,I can usually solo the last 5% of the boss if we get rid of the bees and I'm not in the void pit already. The fight is very simple, just need to keep your head cool, or you panic and fuck up.
Is your gf the tank? If so, tell her she's really only got the bees to worry about and to make sure she keeps them away from you. The fights really easy as long as you don't panic.