According to the Book of Jasher, Egypt did experience internal conflict and civil strife before the Israelites were released from bondage. Here is the context:
The Book of Jasher (Chapter 79-81) describes a period of significant turmoil in Egypt during the time of the plagues and just before the Exodus.
Jasher 79:45-50: Describes how Egyptian servants and officials confronted Pharaoh, demanding he release the Israelites. There was great anger and contention in Pharaoh's court.
Jasher 80:1-4: Records the division between Pharaoh's counselors, with some advising release of Israel while others advised continued bondage, creating political turmoil.
Jasher 81:1-3: Mentions that after the plague of darkness, there was such fear and confusion that Egyptians turned against each other, not knowing who was their enemy.
While the Book of Jasher doesn't describe a formal "civil war" in the modern sense, it does portray significant internal conflict, political division, and social breakdown in Egypt before Israel's release. The cumulative effect of the plagues created conditions where Egyptians were divided against themselves, with different factions holding opposing views on how to handle the Israelite situation. This internal strife contributed to Pharaoh's eventual decision to let the people go.