So what did I do?
First, I read many articles on the topic, good, bad, historical, recent, and indifferent. Tech Radar has a good read on, "How to make Android child friendly". But if you are looking to make that old device a webcam a video monitor, or a kitchen aid, just Google, "reuse or repurpose old cell phone". The search produces so many choices and there so little time to read all 92,000 of them. Then I decided on a plan of action and the functional steps I did are:
1. Hard reset on the device, not a factory reset. How you do this is on your device is different based on the device. We opted for the option described in this Android forum that explains the factory and the hard resets.
2. Synced it with my account. This might be a good time to create that other Google account to associate all of those games, books, and shows for kids.
3. Downloaded Kids Place from Google Play. As you can see the search for parental controls in Google Play produces many results. So tinker with a few, see what other techie parents/Gparents/guardians are using, and review the ToS (Terms of Service).
4. Download AppLock. Again, lots of choices, ask around, ask why and why not, and review ToS and make the selection on your preferences.
Then download/transfer all the child apps to the device. Kids Place lets you select the apps that the child will access and you can see screen shots and the video in Google Play. The only way out is with a PIN. So it works great with a toddler, not so much for the tinkering tweens and teens. By then you can do the family contract on using the device and accessing the home network.
Before you set the Kids Place as the default launch, adjust the settings for email, phone, Internet access, based on your parental control preferences. While this doesn't give her a free ticket to ride I have a little more peace about her using the device without her accidentally deleting my stuff or accessing something she shouldn't in her current mindset.
Of course, recycling and reselling are always options, but with the furloughs this year and the need to hone some tinkering skills and feed the autodidacticism in the family, why not repurpose that old device? What best practices and/or parental controls are you using with the gadget toddlers of today? Any recommended favorite apps?