[distances]

> So long as the emails dont bounce, you're good.

Simply not true. I suggest you try yourself and see how long the account stays unlocked.

[KaiserPro]

> My mum has a shadow facebook account for a number of reasons. She only has one friend, its on a shadow email. It's still active after a good 6 months.

I mean I don't know how I can make it any clearer....

[distances]

Well this is a pointless discussion. I've tried it and can just repeat myself, try it yourself and see your new burner account locked. I've no insight to how and when your mom created her accounts.