At NREIG, we strive to provide clear and comprehensive communication about the coverage options available to our clients.

Do not communicate with the tenants except as advised by the attorney.

Start by documenting everything—dates, incidents, and any communications.

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

On the other side, the bigger companies have more experience and their numbers tend to be more accurate (not always)... as they are big companies "their costumer service" and communication is better but at the same time they "have more mouths to feed" if we need to be honest so can get a bunch of ok or good deals but I kinda doubt they will be great (just my personal candid opinion).

I'd recommend communicating more with the PM directly.

Document all your efforts, including repair invoices and communications, to show you’re acting in good faith as a landlord.

It may be that they are underwriting the property at a significantly different valuation than what you are using or that they feel that you or the deal is excessively risky.Great advice here, and a good HML will have an account rep or someone to communicate with you through the process so that you know. 

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

As for property management software, options like Hostaway or Lodgify can streamline bookings and communication.