Hello dear
As you mentioned that you dedicated your childhood and teenage life to your mother only and did everything ti make her happy. It is your thought that you might be bad daughter but that is not true. Your mother might be depressed due to her life conditions. You can try consulting a clinical psychologist or a psychiatrist through online consultation or in person for diagnosis and treatment.
Next Steps
consult a psychiatrist or a psychologist
Health Tips
spend quality time with her, try to engage her in household activities to make her feel good