please remember, your daughter is allowed to call others by any name or label that she chooses. she is allowed to post on social media. she is allowed to flounder her way thru her life as she sees fit.
your mission, if you chose to accept, is to let her be and keep your distance. just yesterday you had posted about being happy. now today your upset by a dumb facebook post. your daughter is not going to change. accept that and give her a wide berth. VERY WIDE. extricate yourself from her goings on. no good will come of it.