First, your skills don't synergize very well. For example, the Momentum passive will really only ever trigger if you have Dashing Strike as an active skill, so you're losing out on something potentially more useful there. Likewise, the Combination Strike passive is useful if you're using multiple spirit generating (primary) attacks, and you're only using Way of the Hundred Fists.
I would suggest these two passives in their place:
http://us.battle.net/d3/en/class/monk/passive/seize-the-initiativehttp://us.battle.net/d3/en/class/monk/passive/chant-of-resonanceSeize the Initiative will give you a massive survivability boost since you have a lot of Dex. Chant of Resonance is just all around useful to have.
Next, if you're having trouble staying alive, I'd suggest switching up your mantra to either Evasion or Healing instead of Retribution, which requires you to get hit to be useful.
Lastly, why aren't you using a shield or second 1-hander in your offhand?
Those are all things you could do that don't require additional gearing and would help you out immediately. Medium term, I'd suggest looking hard at your skillz and figuring out one class of elemental damage (cold, fire, lightning) to focus on, then stack bonus elemental damage for that type on your bracers/amulet. I know she's level 60, but look at my monk for an example:
http://us.battle.net/d3/en/profile/Triumph-1211/hero/20987076All of her attacks have the lightning type and benefit from any stacked lightning damage that I can get. This won't show up on your sheet DPS because Blizzard are weirdos, but it WILL make a difference in your gameplay- shit will go down much quicker.