Best management options for a portfolio of 30 properties?

[Clayton Coombs]

Hey guys, my mom has a portfolio of 30 properties (mostly Florida) that's she's been managing for many years. She's getting older & wants to enjoy her time & not have to worry about managing anything anymore. I'm going to help her get some systems in place & find someone to manage the properties for her. Most of these properties are single wide trailers but some are houses. Most of the properties are located within a 10 mile radius. 

I wanted to see what programs you recommend for rent collection & accounting? (She currently has a mess of cash, zelle, checks, etc. & not a good way to track expenses/ rent roll)

What are your suggestions on finding a good property manager? She's afraid of hiring someone she can't trust. 

Thanks for your assistance!