Can an emergency temporary guardianship (ETG) appointment be renewed after the initial period?

Yes. The initial period is going to be 90 days. If the petitioner can demonstrate to the court that there is a reason to extend it, then the court can grant another 90 days of guardianship. So, in total you have a period of 180 days where the petitioner has the ability to make medical and financial decisions on behalf of the ward, or the respondent as we know it.