Thanks for your info on Chintpurni maa. First of all, we should be clear on "what the 51 Shakthipeethas list is". It's a list of important Shakti temples as given in Tantra Chudamani. Other lists of Shakthipeethas are also present, for example, 51 list from Shiva Charitam, 108 list from Devi Bhagavatam, 18 list from an Adi Shankaracharya's Stotram etc. Personally I collected about 8 standard and different lists. But, couldn't identify their locations completely, that's a work still in progress. In addition to all these, local lists do exist, like 9 Shakthipeethas of Gujarat area, Chattisgarh area etc. Some temples gain the status of Shaktippeth without being included in any list. Vijayawada Kanaka durga temple is called as Shakthipeeth in Brahmanda purana, but not present in any standard list.
As you told clearly, Chintapurni temple may also be a Shakthipeeth. We would be very happy if you can throw some light on this temple. It would be greatly useful to our research in identifying the locations of all known lists.