Why did Noor Jehan stop singing for actress Firdous?

Re: Why did Noor Jehan stop singing for actress Firdous?

Noor jahan did two marriages

First: syed shaukat hussain rizvi (director/producer)-------> kids were (akbar hussain rizvi, asghar hussain rizvi and zille huma)

Second: Ejaz Durrani (actor/producer)-----> kids were (hina, shazia and nazia)