Ohh mommy ... Fighting
Please try to feed her more frequently ..if she can't suck the bottle ..you can feed with baby spoon or dropper..
My son birth weight is 2.15kg and he gained 3.8kg when he was 2 month.
Set up alarm every one and half hour.
Even if she can't suck , try dropper for at least 20 ml each feed .
Total 24 hours amount should be - around 300-400ml per day ( 10-15 oz per day)
Please try and be strong mommy.
I really understand you and your stress ...
I am also there and now baby is ok
Please keep trying mommy