"AOSP Android"
Warning massive derail... One thing the tech commentariat has slacked off on is better labels for different Android flavors. I'd suggest:
AOSP = "Opendroid" (forkdroid?)
stock Android (Opendroid + Google services/ecosystem) = "stockdroid"
Android + Touchwiz/Sense = "Samdroid"/"Sensedroid"
Opendroid + Amazon services/ecosystem = "Amazdroid"
The grandparent's desire is isomorphic to wanting Google to force users to spend more on their phones so she has to spend less on her software. That's not a good business tactic.