Yes - I'm not trying to find technology approaches to block someone who's determined to circumvent them, far from it.  She's an intelligent child, who understands that there are things out there that she may not be ready to deal with - but, at 11, still quite capable of stepping in the wrong direction without realising.

Interested in your response - can you elaborate a bit? This involves me as the primary account holder and her as an additional (non-restricted) account? I can install Play Music under my account, but she can use it in hers, whilst maintaining her own GMail, Calendar etc (But not G+)?

OK, I've done a lot of Googling around the best approach to what I want to achieve, but found nothing that answers all the criteria in a way that I'm clear is the best answer.  So I figured I was best off laying out the detail in a relevant forum and see what came back, since I'm sure the requirement is actually quite common.

I bought my daughter a 2012 Nexus 7 for her 10th birthday, just after it was released. (And liked it so much, I ditched my iPad and bought myself a 2013 when it came out - but I digress...). I've worked in IT for almost 20 years, have a coding background: I'm not scared of it, won't be phased by complexity, but don't want to know about any solutions that rely on rooting the device.

At the age of 10, I wasn't letting her near the device without ensuring she couldn't wander somewhere I didn't want her to: After researching the topic for a while, I installed Funamo on it, which seems to work OK, although I have reservations about the inability to properly lock down Safe Search in Chrome - search results can be pretty eye-opening in their own right. The device is set up with her as the owner, with a pseudo mail address at a domain I own. Mail to this address goes to me, as it stands (easily flipped to her own mail account when the time's right). I use MS' Family Protection on home PCs, which works very well. Play Store is set up with my Google ID and locked down, a bit. All good. She also has a Gmail address, unbeknown to her, since I figured that in time I would want to expose her to aspects of Google's provision as she was ready for the facility - but does not currently use mail at all

She is now well past 11. I would like to give her access to email. The Nexus is up to 4.3 Android, with additional profiles / restricted profiles a possible route - but there are some clear musts in the way I want it set up:

 - She must have access to her own GMail account. This rules out any route that involves a restricted profile AFAICS as they have no mail. I don't want a solution that involves a different mail service as I can much more easily monitor her usage in GMail - and all of the rest of the family is in Google services anyway, so far better for shared calendars etc)
 - Parental controls needed on web access, social media, apps etc (Funamo the only route I'm confident in, but not sure how it works with multiple profiles, although sure it can). I need to protect her - at least for a year or three - from stumbling on the unsavoury.
 - Access via my Google account to Play Music (which she currently has - all of her music is also in my account)
 - Sharing of apps in my Google account, primarily because I don't want to have to pay twice.  I could give this one up if I had to, but I still want to control her access to the Play Store for the time being.

In September she'll start High School, and beginning to relax some of this becomes inevitable - but, for the moment, I want control and visibility.  She isn't untrustworthy - but she is 11, curious and will do dumb things :-)

I'm amazed there isn't better guidance around this out there - but, if there is, I can't find it. For a younger child, it's straightforward - restricted profile and watchful eye / Funamo. A wizened teenager, easy - it's your device, here are the rules, relaxation of Funamo filtering until remove it and you're on your own in mid/late-teens.  But for a child moving from former state to the later - really hard to know the best approach. I'd really appreciate any thoughts - or advice on where I might turn for answers if this forum draws a blank.

Thank-you!