I thought I would first look through the output of the terminal while building the dmg on my new Sierra MacBook first to see if there is any clue why it wouldn't work from the dmg on my wife's computer. I noticed a couple of things. They might be nothing, but I thought they were worth noting. Are these no big deal?

During all the otool checking, copying of dylib's and changing @rpath and @executable paths:
Skipping Copy: libindi.1.dylib already in Frameworks
Skipping libcfitsio.5.dylib, not executable
Skipping libraw.15.dylib, not executable

During dmg build:
ERROR: no file at "/opt/local/lib/mysql55/mysql/libmysqlclient.18.dylib"
ERROR: no file at "/usr/local/lib/libpq.5.dylib"