I have a friend who saves every animal....even the possums that broke into her house,or the house sparrows that replaced all the native birds. She saves and I kill.We just don't talk about it anymore. It would be tough for animals to survive without their parents,and it is considered illegal in most states to relocate any way.
If your friend can not respect your reasons for doing this then either do not talk about it with her,or tell her she is welcome to come and take away all animals for relocation.Possums are pretty easy to handle,but there is no way I would want to deal with getting a coon out of a trap.Even the babies can be quite difficult.