Question

Uma wanted to know whether my aunt had arrived

how to change this sentence to indirect speech

Answer 1

This sentence itself is indirect speech. If you want to convert to direct then :-

Given sentence has "whether" so it means the Direct speech would be interrogative.

Since here "my aunt" is used, this mean Uma is asking "me".

"had arrived" is used. Had arrived is past perfect. So it will change to present perfect whole converting to Direct speech.

Hence your answer is

Uma asked me, " Has your aunt arrived?"