The primary home value is not considered on FAFSA.
Also if your parents are separated in the sense of not living together as a couple anymore, not just separated by distance, then only the info of the parent you lived with more in the last year, needs to be reported.
So if your parents filed taxes jointly in 2016 your mom would need to separate out her share of the income. And if your parents jointly own the house in CA, she would have to report half of the value in assets.
Also the balance in qualified retirement accounts does not need reported, but what your mom contributed to a pretax retirement account like 401k in 2016 is reported on question 94a on the FAFSA as untaxed income.
So share that information with her and have her help you with the correction.