Ok, someone on Twitter stepped in and talked to the girl. She apologized and offered to do 2RT for the price of 1 that I paid her. So I told her that once the order follows through I will clear her name.
Also, maybe it's a guy, but I just assumed its a girl based on the photo.
EDIT: she has posted. I no longer have any complaint with her.
Well, usually i see the issues for this forum are resolved when brought to the notice of everyone on the Scam Accusations thread, but this is just one of the issues resolved which didn't have the direct link to the bitcoin talk forum. (as i assume she does not have a bitcointalk account).
After reading all of the conversations of you people I can surely say that you are an easy target for such scammers. She threated you that she will distrust you and you sent her crypto without knowing that is she legit or not. By the way, why would someone send $50 to an account with 52k followers only? I think you will have to understand that many people on twitter have more than 52k followers and they might charge you less then $50 for a retweet.
I don't know which project OP wanted to promote (or if it was even a project), but yes, if he could start a bounty for that project, he can get better effective marketing (with many tweets / retweets) as compared to get only two retweets for 50$.