Professor moving group project member in the middle of the quarter. What to do? So I'm faced with an ethical dilemma and want some second opinions on how to approach this situation with a poorly calculated decision that my professor made.
So we have groups of 4 people for group projects which were created randomly by the professor. A new student joined the late (1-2 weeks after) and my team member volunteered to have her join our group when every group already had 4 members. However, it's been 3 weeks already since the group projects started and the professor decided to ask our main team member who has been our unofficial team lead to change groups because a student from another group is dropping the class at the last minute so that she can balance out the teams I'm guessing. She spoke to the team member whom she wanted to move privately before the weekend after class and then decided to inform the rest of the group that he's moving to another group. The person moving was the person who volunteered to add the new person into the group. 
So naturally, I was infuriated in the manner in which she decided to supposedly balance out the head counts and that too a month into the quarter and also for choosing the group member who has been our primary facilitator. 
I replied to her email saying that I wished she had talked over this with the whole group and suggested that she move the member who joined our team late since she invested less time and effort into the project than the rest of us. She replies to that email saying: 


  I am disappointed to hear you call out another person in the group, asking her to be excused, without giving her an opportunity as well. Please see me after class next lecture.


Clearly I didn't want any member to leave, but I thought it made more sense to move the newer member to a different group as she would leave behind a lot less of her efforts and thus would be the least disruptive way to do it. I spoke with the rest of the group after this reply. 1 other member said that it should either be nobody leaving preferably, but if 1 must leave it should be the newer member which I agreed to 100%. Even the newer member was understanding of the situation and said that she's willing to let the professor know that she doesn't mind volunteering to leave, but hesitated when her reply said that her decision was final. 

So I don't want a target on my back, but this professor is making my remarks seem more controversial than they really are. What would be the best way to further communicate about this with the professor?
The professor went behind the group's back by speaking to that individual privately and then announcing the move. This looses the moral high ground from the start...

The "best" manner to have approached this would have been for the professor to have met with the whole group and say "One group is now short and you are plus 1, so could you agree on one person to move". I have had to do this with many groups for projects and, if you show the position and let them work it out, it goes much easier.

Perhaps the professor is "new" to dealing with groups, but IMHO this was handled incorrectly and is difficult to sort now.

Meeting her with the whole group may be best, but whatever the final result (ie who gets moved) she may "target" you for showing her up... As an adult and teacher she should recognize her own fault though... But good luck with that -  it does come with experience... I have been dealing with 30+ plus groups of 5 for 20 odd semesters...