Oh my goodness! What a distressing experience for both you and the kitten. It's going to be awful for you having to wait but you know you have to, no choice in that at all. I'd suggest putting a plank inside at an angle but you would hurt yourself more. Do you have any idea how the mother cat got into your crawl space? I'll keep dashing into this thread during my work day to see how thing progress. I feel sure that there will be a positive outcome but we'll all be on tenterhooks until we hear about the rescue.