Your question involves legal issues, so you should seek legal advice.

When you select the next tenant I would certainly ensure that you have your eyes on the applications that are coming in, and ask that you are involved in the decision making process. 3x income, clean credit and background checks should be a minimum for approval, even if it takes a month or so to find someone. 

If you do contact her broker, this is what they are going to say if they even do respond because brokers don't care to get involved in anything even though it is their job.When an investor says "she advertised the property as highly profitable" it usually means they just accepted that and are taking no responsibility at all which is silly.

And flipping is more active and requires a lot more involvement.

They are most likely having to do the same thing for banks and other things they were involved in, it shouldn't be anything they have an issue with. 

Your question involves a legal issue, so you should seek legal advice. 

I appreciate the feelings involved with people going through something like this, but I would never as a landlord say that I could not ask them to leave.

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Was a licensed engineer involved to design to repairs?

You want to make sure they're involved early on in the process.Depending on the state you could also be liable for anything that happens to the squatters while on your property.