Hi,
I think it really is down to her being sick - there is not much you can do in these circumstances. This is definately a case of thank goodness she is breastfeeding (and don't let anyone suggest that breastfeeding or baby led solids is the problem) She sounds like she is eating a pretty good diet. Nothing wrong with her eating hummus, cottage cheese and olives all day (OK, maybe easy on the olives!) Are there any allergies in either side of your families? Eczema? asthma? coeliac? Dairy can be a good way of getting calories into some-one who doesn't eat much - a dollop of cream or yoghurt on her porridge? Would she eat spaghetti bolognaise sauce? Chicken drumsticks? A glug of olive oil in her hummus?