Many organizations (including the Girl Scouts) have required chaperone-to-kid ratios for trips like this. Booting one chaperone from a trip could put the entir

Many organizations (including the Girl Scouts) have required chaperone-to-kid ratios for trips like this. Booting one chaperone from a trip could put the entire party out of compliance with the organization's policy and require exclusion of some fraction of the group or possibly cancellation of the trip. Typical Girl Scout policy here: https://www.gsnorcal.org/content/dam/girlscouts-gsnorcal/documents/volunteer_resources/volunteer-essentials/safety-wise-adult-to-girl-supervision-ratios.pdf https://www.gsnorcal.org/content/dam/girlscouts-gsnorcal/doc... (Note the requirement that at least one chaperone be female and at least two of the chaperones be unrelated, and note that if you have to split the girls you probably need to send a minimum of two chaperones with each half..)