Yeah, she's pretty young for that. My 2 y/o GSD is a total goofball around the hose. I mean "hose" is one of his favorite words; he stands there, and lets us blast him in the face, and jumps around chasing the water. (It's pretty amusing, but we have to lock him in the house to do any basic yard watering stuff.) My 10 week old puppy watches from the sidelines, and zooms around the perimeters, but the water scares her, and as ToFree says, it's almost certainly too cold for the water itself.
We have a kiddie pool (again, for the big guy), and we only put a couple inches of water in it, so it warms up pretty well. Then I place her gently in it. She walks around in it, splashes around a bit, then jumps out (last week, she whined to get out. This week, she hops out by herself). Be super careful with any pans or pools of water. No more than about 2-3 inches of water. You may not think so, but a young puppy can drown in water that's deeper that that. If they hop in and hurt a leg and can't stand, they have to be able to lie in the pool (until you find her), and still keep her head above water.
I do let my pups out in warm weather. We don't have A/C up here, and it gets hot and humid inside as well as out. I want my dogs to build tolerance to heat, but I keep them in the shade as much as possible. And I'm outside with them all the time to ensure they're not overheating. During the hottest times of the day (about 3pm to 6pm here. 2pm to 4pm in lower latitudes), I do keep ALL the furry kids in the house with fans blasting (that's when wet fur is nice). But I don't direct fans directly on young puppies. Indirect air movement only