I am monitoring listings daily and networking, no targeted marketing currently underway.  

@Sammy Brooks real estate is typically a long-term game.Over time, your rents will go up more than enough to offset increases in property taxes, insurance and maintenance, increasing your cashflow.As @Greg Scott pointed out, there are also other benefits to owner investment real estate.You still want to review your RE investments annually to see if they still meet your goals and to monitor trends that may impact the future ROI.

Well, my rookie mistake was not setting up a system to monitor her work.

Chances are you're now on their monitoring list because the neighbor has reported you. 

You could also have an alarm  that monitors doors and windows My Alarm company will call the cops or fire department as needed.

Then you have to monitor them and be prepared to correct bad behavior or terminate, if necessary.Most property managers collect a percentage of the rent income collected each month. 10% is most common.

Monitor days on market, value add opportunities, rental regulations in the area, and creative negotiations such as seller paying for a points buy down or other closing costs.

I'm also looking for any advice regarding how to keep it secure and monitor it while I get the property sold or rented out.

It's going to require patience, dedication, and persistence to keep monitoring the market and underwriting deals every single day until you find an opportunity that works for you.

If that's the case monitor the property.