Multispinas are QUITE hardy from my personal experience with my Scyther. A few molts ago, I left my Multispina and my Chinese out in the sun, and forgot about them for like 15 minutes, just assuming they could handle the sun. Never agin will I leave a mantis out in the sun. I got to Scyther just in time. He was on his back, and couldn't move. I felt so terrible. I quickly rushed him inside, took him out of the cage, sprinkled some water on him, even cried because of what I had done. Scyther literally started drinking my tears. I had to go to work, so I could only hope for the best. I thought when I got back he'd be a goner, but he survived. I put a crystal on top of the cage before I left, hoping it might bring him and Scizor luck. They both survived! At this moment, they're very healthy and doing great.
I can only wish you luck with your Multispina though! A washing machine is bad news. If she lives, it will be another Multispina miracle.