I agree with everyone: it can be so stressful to run into problems, but now that I have several crazies under my belt I find I'm not nearly as fazed by the occasional mayhem that may crop up. It's like muscle memory: you learn how to respond to certain stimuli under pressure in tight situations.
Per children in shows: I was a children's theatre board member for many years and know first hand that some parents can be difficult, plus they're all still learning (as are we all, they're just earlier in that process), so expectations have to take that into account. It sounds like you did the best you could under the circumstances, and even if you had found a solution on your own, you definitely want to let your SM know what happened and what you did. I one time had an injury backstage that I didn't find out about until much later because my crew members didn't want to "bother" me. I quickly explained that I needed to know about such matters in real time.
Working under good SMs is another way to get a lot of practical advice/experience for how to handle things; I've definitely observed and modeled behavior that I find helpful. Even negative experiences may help, by teaching you what not to do.