I've also talked to a couple of experienced investors on the phone and I will be forever grateful to their advice and for helping me out without charging me thousands of dollars for a coaching program. 

He is 100% solid, worth every dime he charges.

For me in 2023:No LLC’s, 12 properties in 2 states, only 1 state income tax, no w-2’s, a pension and a 1031 exchange.I was charged $1,275, up from 2022 when I was charged  $1,175 but didn’t have an exchange.

Should I charge her a prorated amount of the original rent or the increased month-to-month rent for January?

They all think they charge too much and don't do enough. 

For example: Landlord will pay for electric, water and sewer charges up to $100 per month.

If it turns out that the tenant clogged the drain, we give them one warning and after that we charge them.

Most folks are charging 10% of the rental rate for monthly PM fees. 1 months rent for a leasing fee and couple hundred for a lease renewal.

For a large landlord, they can charge top dollar rent and evict quickly without caring about what's going on with tenants. 

You can be charged with wrong doing up to 10 years after you buy the property.