I bought my baby the Kirkland brand of formula, we’ve been exclusively breast feeding and pumping, with no issues of throwing up. Spit up here and there but that’s it

I only produce EXACTLY what she eats and no more but she is going to day care in a few weeks and I need a back up of milk. So I tried giving her one bottle (4oz) of formula during her feed the other day while I pumped and saved the breast milk in the freezer.

She threw up most of the formula about an hour later ):

Do I try giving it to her again? Maybe half formula half breast milk? Or is that a for sure sign that she is intolerant to that formula?