Did Sayyida Khadijah (may Allah be pleased with her) die due to her weakness caused by eating tree leaves during the siege of Shi'b Abi Talib, and what are the narrations reported concerning the cause of her death?

Sayyidah Khadijah (may Allah be pleased with her) passed away a few months after the exodus from Shi'b Abi Talib, and it was said that it was three days after the death of Abu Talib. There is no reliable text stating the cause of her death.