adopted at age 6. I cannot imagine the disruption in her life prior to that time, and don't know what trials she endured (my wife's father left when she was a toddler, and despite her amazing mother marrying a wonderful man who helped raise HCBW, I know there are lasting scars for both of them).
Biles also went through the Karolyi years and the Nassar scandal. Gymnasts were abused emotionally, physically, and sexually, including Biles. Many people knew there were problems but turned a blind eye because it produced some shiny pieces of metal. Many of those girls will struggle with that for the rest of their lives. Skinner was protected from Nassar because she always had a chaperone, but still has described the anxiety of going to the Karolyi ranch for training. It would make sense that the Olympics might bring back memories of former trauma, essentially triggering PTSD.
Also, Biles has said that having her adoptive parents in the stand supporting her has always been a huge support, and now due to COVID, she is there alone, without her support system.
We don't know the pain and heartache that fills another person. We sure as yewt shouldn't be judging people for what we don't understand.