Social Security will consider all assets a person has and all income available in a household in calculating whether someone qualifies for SSI or if there is a reduction. Each state has different income standards so I will not be able to comment on Arkansas standards, but most likely the problem is that the $900 i over and above what can be earned in a household without a reduction of SSI benefits. Supplemental Security Income is a needs based program -- you have to not olny be disabled, but not have assets/income above a certain level. Social Security Disability Income on the other hand is a disability program that workers pay in based on their wages and have to be medically qualified to draw benefits.
You may wish to visit your local Social Security office in person or visit their website at http:www//SSA.gov for more information.