Need help for a mother in law situation

[Gary Newsom]

Help appreciated in suggesting the best way to accomplish this. I will lay out the details and then the question. 

My mother in law is 85 years old. She owns her house (modular home country setting) free and clear. It is worth approximately $150K.  She is getting to where she needs to be closer to us and we are trying to find  a situation for that to happen. She has no income other than social security and no real savings.

We have found a property close to us that looks pretty acceptable...price is $165K. Obviously we could sell her property and she could buy the other, but what about renting the current property? We have discussed with a property manager who says she doesn't see any problem getting $1000 a month...maybe a bit more and that it should rent easily. How can we manage for her to buy a house without selling the one she currently owns...keeping it for a rental and having the rent pay the mortgage on the new property. Will a banker look seriously at that since she is 85 with no income? The rent would more than pay her mortgage. If not a regular bank, how would you suggest we go about this? All advice appreciated.