What is the difference in Spanish between she and they, and the different forms of each?
She is ella, and they is either ellos or ellas. Ellos is used with all-male or mixed company, and ellas is used for only female company. The traditional conjugation is that ella is conjugated in the present tense by dropping the infinitive ending and adding either -a (-ar verbs) or -e (-er and -ir verbs). The third person plural (ellos and ellas) is conjugated in the present tense by adding either -an (-ar verbs) or -en (-er and -ir verbs). So for cantar, ella canta but ellas cantan. Of course this pattern generally continues in a sense throughout the various Spanish verb tenses, though it's not precisely the same.
I dont understand the question.
Ella y ellos... what forms are you talking about ?