. - Demanded that her shower was broken and wanted a licensed plumber sent immediately.

Those agents who do not hold those values show themselves quickly in our industry and gain a reputation even faster. 

Nothing is going to be free, however.I agree with Trevor on this one - you'd best be using a secure and reputable payment processor - the fee's will be way less drastic than a system breach would.Stripe or QuickBooks payment are some good ones to look into...Hope this helps?

Finding a reputable lender and real estate agent who knows the area, process and programs would be my first recommended steps. 

Do you have reputable vendors to make repairs?

Reputations and perceptions of an area can change way before the data reflects it. 

While the pipe was open, they ran a camera up the lateral to the house and found some roots, which a plumber removed. 

The plumber who came back to hook up the sink actually asked if I had put in new cabinets!  

Do you send a plumber or have them handle minor maintenance requests like this on their own?

You are now competing with national builders with a reputation.