A friend of ours we've been keeping in touch with via Facetime has had exactly these symptoms, she's quite a bit older (49) and is living in France. She hasn't been tested but said her lungs and throat were incredibly painful, she couldn't climb stairs and just going to the loo was an exhausting process. Her doctor (on the phone) said it is almost definitely Covid-19 but unless she is hospitalised she wont be tested. Symptoms peaked after 12 days and when we spoke to her last night she was still very rough, but said it was definitely easing up.
Obviously everyone is different so I don't know if this helps or not, but she does seem to be slowly recovering without hospital treatment. Good luck buddy I hope your daughter starts feeling a bit better very soon. I dread one of my kids getting it, it's one thing to self isolate myself or my wife, but I'm not sure how we could stay away from the kids if they got it badly.