Grandparent providing childcare

I am a grandparent who lives with my daughter's family and provides childcare for her children. I report this $3000 as miscellaneous income and she claims the dependent care credit. I am otherwise retired and collect Social Security and a small pension. The $3000 is my only earned income. Would I be eligible to contribute to my Roth IRA? Would I also be eligible to claim the Earned Income Credit? It appears that I can according to the turbo tax software.