I think it depends on the context and how and why she said it. It might be that she felt that you needed some reassurance for some reason, and wanted you to feel less isolated. In general, though a teacher might need to comfort a student, it is not professional to use the word “love” when speaking with a student. There needs to be a certain level of respectful distance between teacher and student, and it is too easy to cross a line.
I may be expressing myself poorly, but if YOU felt creeped out, then something in the way she said it made you feel that way. You would not be asking a bunch of strangers our opinion, if you did not already feel a little uncomfortable.
I think teachers ideally should be nurturing and loving, but also very professional and circumspect in their private conversations with a student. That is for their own protection, as well as that of the student. V’hameivin yavin.