I would do some research on mobile home parks first. Are there any in the area she would like to be? Perhaps an over 55 yrs type of park? Investigate the same as any other neighborhood. Then speak to the manager and find out if any homes are for sale, Often the manager or owner of the park acts as a real estate agent. Obviously if she is able to find a used home, her initial cost will be lower and since she would be living in it, how important is the resale value to her?
I lived in a mobile home for the first 5 yrs of marriage and liked it. Had a nice modern home, family park, some rules to consider, but no worse than a condo.
Hope she finds something that suits her.