(many contractors are going to bite off more than they can chew and communication will be key). 

Assuming you already paid for the first occurrence, if it happens again and the plumber doesn't find anything wrong then, yes, the tenant should be responsible for the invoice.Your PM should be setting those expectations when they communicate with your tenant."

I recommend that you only communicate with the tenant in written form (email/text) which can be used in an eviction proceeding. 

You probably had a gut feeling when you first approved her, but you hoped it would work out.Stop communicating with her.

This will cut down significantly on the issues you may have down the road with communication, paying rent on time, caring for property, etc. 

I highly encourage all my tenants to keep open communication with me about any struggles to pay rent, and generally they do.

Keep good track of communications and do not sink to his level if he gets nasty.

I will say that communication with OpenDoor is much better than that of other institutional sellers I've worked with.

I'd recommend communicating more with the PM directly.

How can I communicate with you?