Is queen fairy Teresa atau not?

Probably no. Her archetype is like on Aunt Elisabeth/ Azura/ Enchatress- magical (or not so) helper of protagonist. In angsa, swan Lake, probably only Barbie, as Odette, and Summer as Marie (but, in 2003, when angsa, swan lake was came out, isn't Summer, lol).
Also, I think, that in old classical film from Barbie's friends was only she herself. Teresa, Summer and Nikki appears later, in Diamond castle, natal carol & Three musketeers.