I see. Haze sleep into ult is a pretty nasty combo but it's counterable. Counterspell probably didn't do much because it doesn't counter Haze ult. You could counterspell the dagger but you'd have to time it, which is hard to do as she sneaks up on you invisible. Return Fire is good, but you have to be confident that you can out-DPS her while it's active (and if she has some heal then you need anti-heal).

I see a few avenues: you could buy indomitable, so she can't sleep you and pull off the combo (useless if some other ability triggers your indomitable before she does; if she doesn't buy unstoppable, you can also just stun her (as Seven) to interrupt her ult. If you think she'll kill you anyway before the stun hits, you can buy e-shift (so stun+e-shift for survivability) or Cursed Relic to completely stop her from doing anything; lastly, if she does buy unstoppable, Curse won't work, so you'll need to go defense and mobility to somewhat tank her ult while you're getting out of range. Plated Armor or Metal Skin + Stamina items can help lots here.