Hello and thank you for entrusting me to answer your question.
Under both California's Paid Family Leave and State Disability programs, claimants are entitled to 55% of their average weekly earnings up to $1,067 per week. No claimant, regardless of their income level, is entitled to more in wage replacement under any state assistance program. See here for a chart which calculates the amount in benefits relative to income: http://www.edd.ca.gov/pdf_pub_ctr/de2589.pdf
Since your wife is making $2,500 per week, she would likely be entitled to the maximum weekly benefits amount under either PFL or SDI, but regretfully there is no way that state assistance alone will bring her up to her usual income level, as SDI and PFL cannot be drawn upon at the same time.
Unfortunately, the only way to obtain 100% wage replacement is to use employer-offered sick leave or vacation leave. However, this assume that your employer offers such leave and that your wife has accured enough such time to cover her entire absence from work.
There are other programs, such as California's Pregnancy Disability Leave Law and the CFRA's "baby bonding" law which permit pregnant women and new mothers to take protected time off work, but those programs unfortunately do not provide any sort of wage replacement---they simply secure the woman's position while she is gone. SDI and PFL are the only state programs which provide actual wage replacement for expecting and new mothers. Thus, the only options to "fill the financial void," so to speak, are to enroll in either SDI or PFL, or the use accrued sick or vacation pay.
I am very happy to discuss your wife's options in further detail, or to discuss the baby bonding and PDLL programs I referenced above if you desire more information concerning unpaid protected leave. I am sorry I cannot provide more favorable information with regard to your wife's options for wage replacement, but I do nonetheless hope that you have found my answer thus far to be informative.
Very best wishes to you both, and congratulations with regard to the expected addition to your family.