As fluttermoth has said, the typical endler available in the trade is typically an endler/guppy cross, not a true endler. Unless you can get collection data on your female endler or know something else about it, chances are good that you are dealing with a cross. In that case it will not matter much what you do with her.
As a breeder of true endlers I am often dismayed by the weird crosses, pretty as they may be, that are misidentified as endlers in a shop. There is nothing that anyone can do to prevent a shop identifying any old fish in a manner that they choose so I often just give up. If you are not getting your endlers from a reputable registered breeder, you probably are buying crosses. On average they are prettier to most people than the real thing so they are what the shops carry.
