Then don't negotiate. Go alone.

or don't go at all

Of course it’s negotiable. Your counter-offer is “No fucking way!”

over 18? then tell her enjoy her trip with her mom..

under 18 and she's paying? deal with it.

I dont know or heard of many under 18s going on a holiday overseas without their parents or any form of supervision.

Repeat after me: "then you are not coming."

At least you get to go on trips. You can always chose to not go with your friend and her mom. Some people would just be happy being able to go.

your misunderstanding it. her and her friend already booked a holiday together without one friends mum. now the mother wants to come and the mothers dsughter is saying its non negotiable. i wouldnt be happy if my mates mother was going to come on a holiday with my and my mate after we planned n booked it together.

did you delete your reply? i got a notification saying yoh replied but can't see it here. not bad mouthing just wondering is all.

Of course it's negotiable. Mom comes, you stay. Mom can have your ticket and you spend quality time alone.

Is she paying her own way?

so... you were doing it all for the nookie and she's telling you stick in your... yeah??

Why don't you bring your father?

You could go alone or not at all.