to send my dd in to school with a name badge.

[TheEnthusiasticTroll]

her new teacher keeps getting her mixed up with another girl, easily done. They both have long brown hair.

DD last week was getting a bit irked by this, but I reasured her it was O.K as she has only been there are week and its understandable.

However today this resulted in my dd being refused firstly to go to the toilet "as you have already been", the other girl had already been and refused to get a drink of water as "you have already had 2" the other girl had already had 2. And on pointing out the mix up of identity my dd was told It doesnt matter who you are I said "no"

Shall i send her in with a name tag tomorrow?

I teach secondary and will generally let kids go unless it is ten or less minutes until the end of the lesson or the child is a known pisstaker. I let one lad go once and he came back after 15 minutes!!! I said no to him after that.

O.K thanks so having a word would not be OTT.

my sis put name tags on her twins for a good while so the teachers at nursery and school knew them apart

i was called my my sisters name so much at high school that i actually answered to it. I don't look anything like her - god knows why they could never get my name right.

what a mean teacher not letting them go for a wee!

under no circumstances is it acceptable to say 'no' to toilet or drink requests in my school

Why? The teacher thinks it's another kid. So if said kid has already been out about three times the teacher isn't BU to think that they don't really need to go out.....I probably needed the loo 1/3 of the time I asked to go, in school. I just wanted to escape for a bit and mess around on the way to and back.
Theory of mind ftw!

Agree with quirrel!!

but my dd pointed out that she had not been at it was the other girl who had. The teacher said, it doesnt matter who you are i said no.

Yeah, that was not good. But teachers are human and frazzled. A lot of people are jumping on the action before she was corrected. Tough on your DD, but maybe you could tell her to be more insistent in future- she shouldn't have to be, but we all need some extra help sometimes.