@thumper1 I did some searching to find out if co-op money would affect EFC and I am pretty confident that it does not.
I found this from fasfa.gov website
The response indicates the total amount of taxable income the student earned under a cooperative education program in 2015. Any income earned from work under a cooperative education program offered by a postsecondary institution is excluded from need analysis in the determination of the Expected Family Contribution (EFC).