HELP! MCHN says night BFing is causing DD's weight to be "Borderline" underweight

[Phteven]

Can you visit a different MCHN?

[Lenny]

Can you visit a different MCHN?

As Onyx said. You are perfectly entitled to visit a different MCHN. It was common in my neighbourhood - we had one terrible MCHN, and a really well liked one nearby.

[onthefly]

Where are you? Maybe someone can recommend another nurse nearby? Or just don't bother with them. She certainly doesn't sound very helpful.
My DS was dreadfully sleep deprived for years and is sharp as a tack. He'd be starting school by now if he'd gotten enough sleep (according to her illogic).
I night weaned my DS at 14 months and I did notice him eating more during the day. However, he also ate food during the night to replace the milk and his weight gain did not increase. (he's also fairly slight, though a bit bigger than your DD).