As long as she can rent it the $200 will be made up in depreciation. What would stop her from being able to make the payment? A pain, maybe, but not a disaster.
ARS
Edit: Of course if she did a poor job in buying (location mostly) or has dead beat renters, or a variety of other low percentage bad things, it can be more of a problem, but renting is a fairly normal activity, and is more often than not done at a small loss to begin with.