Well, you're kind of in a rough spot.
You have MT and you're building Cavalry, but otherwise you're far behind all the other civs, who have Chemistry and Grenadiers on you. Some may be close to Rifling to counter your Cavalry soon; they'll certainly bee-line to it if you attack, and there goes your (very slim) advantage.
Asoka and Mansa have a defensive pact, likewise Mansa and Cyrus. So I can tell you who NOT to attack, and of your indicated targets, that's India, since you'll be facing counter-attacks from India to your north AND Mali from your west. So if you have to attack anyone, I guess it would be Egypt.
However, everyone else is either "Friendly" or "Pleased" with Hatty. So even if she has no defensive pacts, you're still going to earn some diplomatic demerits across the board for "You declared war on our friend!", making you the add man out on your lovey-dovey continent. Don't be surprised if she manages to get one of her friends to join in the fun and attack you, especially since your power rating is so far below everyone's except Mansa's. Asoka in particular would probably be right on your case the moment you shift your forces from north to east.
Frankly, I wouldn't be thinking about attacking anyone at this point. You have 12 cities, which is a decent-sized civ, and could do one of two things: either (a) gear up your research and tech-trade to catch up (hint: Steel is a tech the AI values highly in a trade but neglects to research) or (b) give up warmongering and pursue another victory. You may be too far behind for space race and you'd need to do some very fancy footwork to pull off a cultural win, so diplomatic may be your best bet.
From the "hindsight is always 20-20" department: it looks to me like you should have asked this question long before now. Were you the one who wiped out Genghis? If so, good for you, but I would have taken down at least two more civs by now. For heaven's sake, you had Cho-Ko-Nu's, man! What did you do with them?!?