Suncearia Horton, 27, is charged with endangering a child.
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She allegedly left the 3-year-old child in the 14500 block of Empanada Drive on Thursday without any adult supervision.
According to charging documents, Horton attempted to leave the child with her mother-in-law.
However, officials said the mother-in-law was so intoxicated she could not spell her own name.
Harris County sheriff's deputies said the mother-in-law smelled like alcohol and was visibly drinking whisky in front of them.
It was unclear if the mother-in-law would also face charges.