Could be the warmth putting her off drinking them as much not too sure
Are you using the same formula and water? Make sure to offer every 3 hours. Maybe she just sense’s the change and is a little stressed by it, it’s good that she’s still eating something at least. My son always refused formal and wanted to nurse only and I would be stressed out from pumping when away at work. He would eat less for my sister or for his daddy than he would for me. I supplemented with goat milk mixed with maple syrup until I could make enough to freeze. Also now that she’s 6 months you can introduce fruit and veggie baby food and baby oatmeal 🥣
We had this when we went away to turkey last year, we just offered smaller amounts more often but it was defo the weather and the heat but LG was breastfed so couldn’t offer water
Could be the different water?