My niece immediately vomits after drinking milk or eating yoghrurt.

[totaleclipse]

Could this only be a dairy intolorance (sp) she is 14 and this started 2 weeks ago.

For whatever reason, her body is rejecting it so I would avoid daity.

Sorry, dairy.

If she's 14, it's rather odd that it's just happened, and I'd definitely see the GP in case she has a tummy bug or something. Could be an imbalance between helpful and unhelpful bacteria in her gut, I imagine, so maybe some live yoghurt might help.

In any case, I'd avoid milk and yoghurt for a while.

was also going to suggest that a trip to GP should be in order, it's odd that it would suddenly happen at her age IMO.

ALso, horrible thing to consider, but is the start of an eating disorder a possibility or does it appear to be something she can't control?

an intolerance to dairy can often be triggered after a virus or bug, and only usually lasts a few weeks. Worth getting checked out though

Short term lactose intolerance (rather than dairy intolerance)? Has she been ill recently?