As long as you paid more than half the cost of keeping of the home where your mother lives, and you can claim her as a dependent on your return, then you are still eligible to file as HOH.
The amount of income that you earn or the amount of gifts that you receive has nothing to do with being able to claim HOH status. It is strictly based on the fact that you have a qualifying person which you claim as a dependent and you pay more than half of the cost of keeping up a home for that person.
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