Hi,Hayleigh.
Your daughter sounds very much like my toddler at that age.Really filthy nappies,and still quite sicky.Not a lot at one time but little bits here and there,there was always that smell.We did go ahead and change to cows milk at a year.Sometimes they manage the change better if you change an ounce at a time,so 8oz formula to 1oz cows,next day do 7 formula to 2 cows,and so on.
We did find Matilda seemed to have a slight intolerance(I wouldn't call it an allergy )of cows milk.I kept her on the cows milk,but she only had the two cups of milk a day,one at breakfast ,I gave it around an hour after cereal so she was less sicky,and one after tea,again an hour afterWe tried soya milk,and goats milk,she hated both and I don't blame her.I changed her milky puddings to soya and cut down the cheese,this helped a lot.She was happy with that change.We tried goats cheese,which also helped.With Matilda,we also found wheat a problem so had to cut that out too.A few changes to her diet,but the nappies improved,and the sickiness went away.
Matilda's nearly two now and we've managed to reintroduce all those things a little at a time,and she eats everything now.We do have a few problems that cause runny nappies(too much fruit at the moment,I have to be careful with that),and she occasionally has a bit of what I'd say is more regurge than sick(sorry
) but it's a huge improvement on what she was.
It may be just a case of taking something out of your little girl's diet,does sound like milk.It might not be forever. She may well grow out of it,Matilda has more or less done just that.