To purchase a Daisy Purse, you must first go to the Fairy Forest and go to the For My Nursery Tab. This purse costs a value of only one pass, just the same as the Butter Cup Purse. Really it is not only 1 pass, it will cost 2 passes if you would actually like to use the purse. (Most likely you will, because then what's the point of buying it?)
When using the purse, you must 1st buy it from the Fairy Forest, then you can have the option to use your other pass (if you have one, which it is recommended to...) and then 500 reserves will be credited to your nursery.