Frog Bike 67 stem change

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Broadside

Guru
Location
Fleet, Hants
My 10 year old daughter has a Frog 67 road bike, she has recently ridden a track bike and is now beginning to get cramped on her Frog road bike so I want to put a longer stem on it, currently has a 34mm stem which is tiny.

I am struggling to identify the right stem, it looks like a 1" steerer but does anyone know what handlebar diameter is fitted to this bike? I have just measured it with some vernier callipers it looks like 26mm, but I have found there are 25.4mm and 25.8mm bars too and I don't trust my callipers to be that accurate.

I want to put something like an 80mm stem on the bike.

Any ideas what to go for?
 
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