If the Only income she receives is Social Security benefits there is no reason for her to file a tax return.
To be eligible for Head of Household if you are not married you need to provide over one-half the cost to maintain the home and you must have a qualified person as a dependent.
You may be able to claim your parent as a dependent under the Qualifying Relative rules if they meet all the requirements under the rules.
To be a Qualifying Relative -
1. The person cannot be your qualifying child or the qualifying child of any other taxpayer. A child is not the qualifying child of any other taxpayer if the child's parent (or any other person for whom the child is defined as a qualifying child) is not required to file an income tax return or files an income tax return only to get a refund on income tax withheld.
2. The person either (a) must be related to you or (b) must live with you all year as a member of your household.
3. The person's gross income for the year must be less than $4,400 (social security does not count) in 2022
4. You must provide more than half of the person's total support for the year.
5. The person must be a U.S. citizen or a U.S., Canada, or Mexico resident for some part of the year.
6. The person must not file a joint return with their spouse.
See this TurboTax support FAQ for Head of Household - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualify-head-household...
This answer has been verified for accuracy by an Intuit expert employee
