OP, both my DS' are
Eagle Scouts...that being said DH & I have had one millllion scout trips that both DS' went on over their many many years in scouting and I would just like to say their Troop would wait and wait and wait and wait for every last scout even if they are then late leaving for the overnight.
My boys were in scouting BEFORE we had cell phones and could call a scout who was running late hence the need for us in waiting. Even if the meet time was 6:15pm, many times the scouts never even headed out of the parking lot until close to 7pm. DH or I, whoever was dropping off would wait until they all saddled up and left.
AND I might add there have been times (not allot of them) that parents there waiting would actually get back in their cars and drive to the "missing" scouts home or to a payphone to call to see if indeed they are going to be going on the overnight.
I will say WE HAVE NEVER EVER LEFT WITHOUT ANY SCOUT EVER!!!!!!!!!
Call the Council and speak to someone there and tell them what happened.
I find this disturbing and a shame that not one person; leader or girl scout said "we need to wait for (your DD)".........