Above all, I think communication is the most important--if you have an open dialogue and address her concerns, I imagine you'll make progress :) Good luck! 

It's a bit of investigative work, because most likely you will find that most or all of these properties of this size will be held by an LLC or a corporation -- from there, you can proceed on trying to find names behind those companies by searching in the Secretary of State filings in the state of which that company was formed.Once you have your list, start calling or mailing.If you don't want to spend the time doing this on your own, there are subscription based services out there that aggregate this data for you, but of course for a price.

I have a couple section 8 properties in SC and I love the program.My area pays 110% of market rents.Section 8 inspects my properties at least once a year to make sure tenants are taking care of property and I find out if anything needs to be repaired.The Government direct deposits most or all of the rent into my account.Tenants in my experience take care of the property so that they don't loose the free government money.

This requires a level of multiple entity communication and coordination that a title company usually is uncomfortable with. 

However, for most syndicators it's too low a number for the amount of cost and communication on their side. $50k tends to be the going rate for the bottom end. 

Yes, I agree, they are terrible sometimes in communication with potential sellers.

Make sure it's the same email address that she has used to communicate with you in the past, so tomorrow she can't come and say that it is not her email address. 

Make it to that two year mark and are 100% self-sourcing with high levels of service and communication, the momentum starts to pick up on its own because your past client Sally tells her coworker John about her great experience with you, and so on... no one does that with car salesmen, but they sure as hell do with their LO that worked with them to put them into their first house.

Assuming her net worth is below the estate tax cap ($11MM, I think), you wouldn't pay taxes when you inherit her estate upon her passing.If the question is control over her assets and the ability to make financial decisions, you really should speak to an estate lawyer about setting up power of attorney, etc. and making sure that your mom's wishes are properly documented and communicated.

Connect with quite a few of them--see what they offer, gauge their communication, etc.