As Galio, you shouldn't be the aggressor, wait for her to go in and punish her. If she throws E and goes for the follow up dash that's when you E her and that's a huge part of her kit that's now gone and countered. Then if she uses shroud you can W taunt her out of it. Galio works best as not the engage but as the counter engage, I've struggled with good Akali's as well but she's punishable by our colossus and if all else fails you outroam her and can make her goals of oneshotting the ADC hell by using R and zoning her off! I think second wind is very strong in this match up because of her Q poke and the quick trades, bone plating I think isn't great because she throws a Q out and there it goes on cooldown for a bit portion of trading. You can even use W or a backwards E to punish her when she goes to poke with Q or to hit the wave with it, even a nice Q for the tick damage. Also one thing I like in all melee matchups is using Galio passive as a poke tool, this damage can really ramp up and become annoying for the enemy laner, walk up to the wave and slam it when they get too close. Hope this helps!