Rents (dependent on the local area and subdivision, but for sake of this sample, let's use this #) = $1,700 to $2,000.3/2 mobile home vintage 1980s with 1200 sq ft in our area:  Cost $10,000 - 25,000.  

Typical rates are 8-12% of income either monthly or yearly depending on manager.

Splitting a single parcel post construction may also prove a challenge depending on zoning. 

Part of the net impact on brokers and buyers will depend on how the guidance from Fannie/Freddie and lender's plays out.

Depending on how your reserves/portfolio look like, there could be numerous strategies. 1031 exchage?

There may not be any ways, but depending on the gains, sometimes the cost to try and defer is near the amount you are saving... 

Depending on the law where you are, you can give an MTM tenant as little as 30 days to vacate for any reason.

Depending on the state, its either a mortgage or a deed of trust.  

Ultimately, the decision will depend on your personal preferences, financial goals, and risk tolerance.

I assume her credit history shows that she's making that mortgage payment dependably.