Hi there and
to the forums!
I agree, that absolutely does not look good. She needs to be seen by an avian vet right away!
Please take her in as soon as you can, and let us know what the vet says. I'm hopeful she'll make a full recovery with medical attention.
Meanwhile, please read through the links provided by FaeryBee above to ensure you're up to date on the best of budgie care practices. If you have any questions afterwards, please do ask as we'd love to help.
Hope to see you around!