Turbo tax says I don't qualify for EIC but according to the EIC guidelines I do.. I made under 49000 with a qualifying child how can u fix this?

I made 34000, and have a 12 year old am a single mom, filling head of house hold.. I get no help from any one and struggle.. I read the qualifications and according to them I qualify but the app keeps telling me I do not because I made over 18,000 and do not have a qualifying child? I'm confused never have I not qualified how can this be fixed? I went thru and made sure I entered everything correctly.. Please help if you can, single struggling mom