I agree with my colleague's assessment, and unfortunately earnings in excess of the limits will preclude a person from the program. With that said, the number of folks in the household will change the limit. Here is the income information for Georgia.
This answer does not create an attorney client relationship. Claimants should contact local counsel for assistance with their specific cases.
In general, yes, a person who is receiving SSI may receive food stamps. The issue here may be (a) your friend is receiving SSD (or other Title II benefit) or (b) your state's food stamp eligibility requirement puts her over the limits. Many people who are receiving SSI benefits are at basic subsistence level if that, and unfortunately different requirements for different need-based programs often slip through the cracks of eligibility.