I answered the phone and Mr D told me that he was still at the hospital, M was fine, but he was exhausted and I should check my texts and call him back. He had sent me text updates as things happened, knowing they wouldn't wake me, and that way the timeline was clear and coherent as it would not have been if he'd tried to tell me about it by the time we were talking. (He's a smart man.)
The children's hospital had not agreed with the emergency room's plan to send M home. Instead, they wanted her transported to their emergency room, via a special pediatric transport ambulance. Mr D waited 3 hours for the ambulance, because there's only one and she was now pretty low on the triage list for it. (After all, she was stable and in a hospital.)
Around 3am, she was in the children's hospital ER and nurses were attempting to take blood. That was when it happened again. Monitors went crazy and she began turning blue again. One nurse ran out of the room, carrying M and giving rescue breaths as she went. Another paused long enough to tell Mr D that they were heading to a trauma room immediately because M's heart and respiratory rates had dropped dangerously low. Once they had her stable again, she was admitted.
When Mr D and I spoke on the phone, they were in a PICU (Pediatric Intensive Care) room. He had an idea for a plan for the day, so we discussed it. I would get the respite boys up and take them with me to take Peter to his event, drop Peter off, come home to meet person picking up the respite boys, then go back to the event. Seemed like the best idea and it worked fairly well. (The sporting event was the opposite direction from the person who was coming to get the boys, so it wasn't realistic to change that plan, even if I had wanted to call that person -- who I didn't know -- that early on a Saturday morning!) In the end, I missed all of Peter's actual competition, but he was graciously understanding, which was a relief.
M was transferred from the PICU to the NICU on Saturday afternoon, at which point Mr D finally came home. She had spent a total of about 24 hours in our home before returning to the hospital.