On mobile I used rocket launchers, after trapping one inside a octagon style pen. However! Make sure you DO NOT completely immobilise her. For some reason mine became "glitched" into a permanent state of alertness. XD Her torpor was stuck at 435.

Once I enabled her to move again, by breaking down the two gates I placed between her front and back feet. I was able to raise that torpor back up!

Honestly, my easiest method is rockets.... cannons take too long, and require dedication of placement. Launchers are handheld.