If she is 53 and has worked there for several years she probably makes between $18-$25hr. She has one child and WOULD NOT qualify for a subsidy unless she has more dependents She is SOL.
Monthly Cost Estimated monthly silver plan premium (without subsidy) $618
Estimated tax credit from the government $222
Your estimated monthly silver plan premium $396
If that income is correct she would even qualify for cost-sharing deductible reduction in my state.