{{hugs}} Saw this and had to post something.
I don't really have experience in strikes, but from everything I've learned here, it's most likely NOT self-weaning.
Could be developmental, could be something else.
Is she prone to ear infections? Sometimes that will show in a refusal to feed. Something about the change in position messes with their ears to make an infected ear hurt. Those didn't always come with fevers at our house.
Keep offering. She needs to stay hydrated, especially in the heat. {{hugs}} hun.
Hopefully someone will have better suggestions soon.
P.S. She's such a cutie in your avatar!