I understand the pain has been present since a day.
If there was no injury, we need to consider either raised uric acid or other inflammation as the causative factor.
You need to consult an Orthopaedic surgeon, who will prescribe anti-inflammatory medications and get some blood tests done.
In the meanwhile, she can apply ice over the toe and drink plenty of water.
Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.