How will it effect us if she doesn't pay her portion of the mortgage? If she doesn't pay, what action can we take?

Although I agree with what my colleagues (who have already answered this question) have stated, I believe the specific questions you asked are:...

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Question regarding kicking someone out of the house/eviction

Yes, the receipts for the money orders you gave to pay rent can be used to prove you are paying rent; but the police are not really the ones who...

What are my options against these workers?

To be honest, without any substantive proof (or witness) of the theft, then despite any "circumstantial" evidence, your civil remedies against the...