I wanted to find out the percentage of her instant kill chance. The wiki says 5% (http://kingdomrushtd.wikia.com/wiki/Instant_kill) but in my tests on Steam, it wasn't that low.
Her successful instant-kill shows "SPLAT!" sign.
I recorded my gameplays with music muted.
Because Lethal Strike is performed "in the blink of an eye" and she moves around, I had to be attentive.
1st (storm atoll campaign): 8 out of 38
2nd (the sunken citadel campaign): 13 out of 45
3rd (""): 15 out of 54
4th (""): 15 out of 51
5th (""): 13 out of 54
6th (""): 15 out of 52
7th (nazeru's gate campaign): 10 out of 34
8th (""): 9 out of 37
9th (the sunken citadel campaign): 9 out of 52
10th (""): 14 out of 53
11th (""): 14 out of 55
12th (dusk chateau campaign): 12 out of 60
147 out of 585 is 25.1282....%.
585 is small sample size and I'm planning to play her more and update it.
Once she consecutively succeeded 4 attempts in a row. That was awsome.