She claims her son has been isolated and depressed.  

Yes by $175 per month on one property and by $212 on another and this wasn't simply an isolated event.

. $550 out of pocket as an isolated incident is a small price to pay to tighten up the back end processes.

As long as my manager collects rent in separate accounts, will each cell truly be isolated from each other?

You have crawl before you walk, one thing you don’t want to do is be isolated at home where there are too many distractions and nothing going on.

If they confirm that it's an isolated event, I'd also recommend enabling multi-factor authentication on your account moving forward.

I had interviews with several of these internet real estate gurus regarding their mentorship programs, but as soon as they mention me paying some ridiculous start up fee or splitting a 50/50 profit for the work I solely will do; then I am in the wind.

If someone slips and falls on the property and they sue you it can help isolate your personal assets from the property.

From then on, I either hang up on them or, if I'm bored, jerk them around a bit before hanging up.As of now, I've only isolated four gurus who are actually doing deals and will only consider their information as being valid and worthy of spending BIG dollars on to learn (two are in the Boston are, one is in Virginia, and one is in Atlanta).

The first thing I would do in your shoes is to ensure that my personal assets are isolated from my business assets and my business assets are isolated from one another, in order to protect yourself from a suit.