Hey there, srry for answering so late :s
U can speak in english with me :3
For now there is not an specific word for that, but some ppl call them as "elle" or simply try to avoid using sustantives, cause in spanish is too obvious when you are talking about female or male :v
For example....
"Hola, cómo estás? No te había visto hace mucho tiempo. Te extrañé, espero estés bien"
... etc.. Try to talk to them without using adjectives o sustantives that talk about if that person is a he, she or whatever they are :3
De nada!

Hope this was useful D: