Harsidhhi Mata is a manifestation of Mother Goddess Shakti.
She is more closely associated with Goddess Amba. Legend has it that Sri
Krishna offered prayers to Harsidhhi Mata and asked for help in defeating
Jarasandha. This is a benign and kind form of Goddess Shakti.
You can watch the live darshan here – Ujjain Harsiddhi Mata Live Darshan