Why is she acting different?

So my dog is acting a whole lot different today. I took her out and walked her around and then went back inside and since its so hot I put her in front of the fan so she can cool off. Then my sister and I went outside and sprayed each other down with the hose and cooled off, We also sprayed her down so she wouldn’t be so hot (Its like 90 here and my house temp is around 95) so I wanted to make her somewhat comfortable.

Since then shes been nipping at everyone except me.
Whats wrong with her?