Authorities say 35-year-old Diana Taylor was being held without bail following her arrest Monday.
Emergency responders found Faith Taylor unresponsive when they went to the family's Somerton home shortly before 6 p.m. Friday. The child was taken to a hospital but was pronounced dead there a short time later.
Police investigate toddler death in Somerton
Authorities have not said how the child was killed or provide more details on the investigation.
Besides the murder charge, Diana Taylor also faces involuntary manslaughter and child endangerment counts.
Taylor is being represented by the Defender Association of Philadelphia. A call to their office Tuesday rang unanswered.
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