A Sheri-Lee or a Sheri is batman. During the day shes a regular woman, but at night shes a mean fighting machine. In order to summon her you must use the The Bat-Signal, and only use when in need or there will be dire consequences. Again i repeat she is batman!!!
Say you were walking home late at night and you got robed all u need to do is use the bat symbol and here comes batman which is just plain old Sheri-Lee but just as batman.