Sheridan is a very small community in Wyoming. I'm not friends with the family, but I do know them because it's a small town - they're kind people. The delay could be financial, it could be because her step-dad is a teacher, it could be that there aren't flights from the tiny airport in Sheridan to CA. Likely they'll have to drive to Billings, MT or Denver, CO to get a flight to CA.
People sending prayers from this area is incredibly common and shouldn't be read into. I'm not saying that Erin does or doesn't have a mental illness - I only knew her in high school - but how the family and community is reacting seems very normal to me as a fellow Sheridanite.