Not too shabby. I'm a diehard fan of going Frozen Mallet/Sheen rather than straight Triforce, the guarunteed slow and extra health is a life saver, but Triforce can be very successful. I just don't seem to have much luck with the slow - and your build, which isn't the best in terms of attack speed items (you'll almost never finish that build...) might have chasing issues as a result.
I often go Swiftness instead of Greaves, as the extra speed is very handy for chasing; most of her damage is from abilities and Sheen procs while in Cougar, so the attack speed isn't quite so handy. I can also see Mobility as being an option.
Something that I've yet to try, but could be quite interesting, is sticking a Mejai's in there early on. For the relatively low price, you can get a huge boost to all your abilities, with only one item slot.