Is it permissible for a woman in a state of ihram who has fallen ill and is unable to move due to a diuretic injection to urinate in her place while covered, given her inability to reach the restrooms?

It is forbidden to urinate in the mosque, even into a vessel, according to the more correct opinion. This is the madhhab of al-Shashi and others, and it was chosen by al-Nawawi. However, this applies in a situation of choice; as for a situation of necessity, there is no harm.