J.M.
Hi L.:
I don't believe you were out of line,or should have any regrets. Requesting that your daughter be called by her proper name,is not asking a lot. Its understandable,that at her young age,you'd want her to become familiar with being addressed by the name you GAVE her.If you were tactful and polite in how you handled it,I wouldn't fear any hurt feelings,as a result of speaking up.(Lily) is a short enough title,for them to use endearingly.I wish you and your darlin daughter the best.J. M