Conversation so far:
What happened at Ameesha Patel's struggle phase?
During 2003 to 2006, Patel's acting career entered a slump.
What caused he career to enter a slump?
After the relative success of Humraaz, her string of unsuccessful films followed, and would continue until 2006.
What were the unsuccessful films that were released at this time?
In 2003, her only releases were Tamil language film Pudhiya Geethai and the Hindi film Deepak Bahry's Parwana.

Question: When did her struggle phase start?
Self-contained rewrite: When did Ameesha Patel's struggle phase start?