(((AAAA))))))) you may find she will change her mind. Have her write it all down the money part. So she will see what she will have to pay. Plus have her figure at least one person will drop out of the Apt at some point. So they will have to figure that out. It is hard to give kids thier wings. I know you are a good mom.
Trying talking to her when everyone can be calm about it.
Also explain if she does this, how you feel about it. Also it makes her responsable for her life then.
I hope all works out for both of you.
muffy