Some very restrictive parameters. But I think your sister could’ve still participated:
“16. After I purchase the unit, do I still need to maintain my income, assets or household size?
No. After close of escrow, a household may change their household size by having more children, receive salary increases that put their total household income above the maximum limit for their household size, and hold assets that exceed the maximum asset limitation. It is the collective hope of the Poway Redevelopment Agency and Pacific Scene Homes that households continue to build strong families and increase wealth.”
I couldn’t find anything about resale, but I would think those also have restrictions.