Will this affect her survivors benefits social security income? 

Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

If you need any STR designer recommendations or social accounts for inspiration, feel free to reach out!

Also, are there any social media websites with groups that I could network with that highlight investors & wholesalers? 

These syndication educators teach you underwriting, give you lists of brokers, recommend you increase your social media visibility and are provided techniques and tools to raise capital.

You are watching too much content on social media.

Social media is a double edged sword, that I don't think a lot of syndicators fully understood when tapping into it.  

Become a syndication Co-GP by lending the escrow funds for the true GP where you receive 1% of the GP share of project upside, then create website and social media marketing materials where you hold yourself out as THE GP for the syndication.5.

Market your property and get tenants.This could be through flyers, direct mail, rental marketplaces, newspaper ads, or on social media etc. 6.

Unfortunately most have made lifestyle changes relying on checks that will never be cashed but can't fault the inexperienced investors with the amount of materials online, social media etc. where coaches, mentors and gurus share the ease in which they generated massive wealth in these neighborhoods.