Question

She said I visited Oxford university yesterday

Answer 1

She said that she visited Oxford university

the previous day...

Explanation:

If there are words like 'this', 'next day' etc in direct speech, then in indirect speech it will be 'that', 'the following day' respectively.

As your question is in direct speech therefore 'yesterday'will change to 'the previous day'in indirect speech...

Answer 2

Answer:

तुम्हारी मम्मी की चुदाई