I am adiparashakti Mahalakshmi who killed Kolhasura was 4 armed, the form that is worshipped in the main Kolhapur temple. And She is Adyashakti, even superior to Vishnu. Hence she cannot be born from Vishnu’s body. Rather is the mother of Lakshmi and Brahma (according to Pradhanik rahasya). Also, she is Triguna Parmeshwari. (Sarvasyādyā Mahālakśmi Trigunaparameśwarī - this is Her mantra) And she did kill Kolhasura with the aid of Katyayani. That’s what Karveer Mahatmyan says. And her dhyana mantra says that she holds Matulinga fruit, Gadā, Khetak (shield) and a drinking vessel. And has a Shivalingam and a snake on her head. (Matulinga-gadā-khetam-pānapatramcha bibhrati, Nāgam-lingam-cha-yonim-cha bibhrati nrupamurdhni.)